the point - of - sale system of fig3 includes vertically extending , wall - mounted pegboard 40 including circular holes 42 . pegboard 40 fixedly carries fixtures 44 and 46 , on which are fixedly mounted horizontally extending elongated elements in the form of rods 48 , 50 , 52 and 54 , pairs of which are connected together by vertically extending struts 56 and 58 , as well as horizontally extending struts 60 . struts 56 and 58 respectively fit into openings of fixtures 44 and 46 . point - of - sale devices 62 and 64 are respectively hung on rods 48 and 50 behind placard 67 , which is mounted on rods 52 and 54 and includes information about article 66 , carried by point - of - sale devices 62 and 64 . article 66 is a picture hanger including plate 10 , nails 14 , and hanger structure 16 ( see fig1 , 2 a , and 2 b ) and is located , in assembled condition , on cardboard panel 68 , including horizontally extending elongated opening 70 , sized and oriented for enabling point - of - sale device 64 to be mounted on one of rods 48 or 50 . article 66 , in assembled condition , is located in a chamber , i . e ., container , between planar surface 72 of panel 68 and exterior surfaces of one piece , transparent plastic cover 74 , which is fixedly mounted on the planar surface . thus , article 66 can be considered to be behind cover 74 that forms a transparent region of point of sale device 64 . container 74 includes walls 76 , 78 , 80 , and 82 , which extend approximately at right angles to planar surface 72 and to each other . at the bottom of walls 76 , 78 , 80 , and 82 is flange 84 , having a bottom surface abutting and fixedly connected by transparent glue to planar surface 72 . at the top of walls 76 , 78 , 80 , and 82 is ceiling 86 of cover 74 . ceiling 86 has a planar surface that extends parallel to planar surface 72 . ceiling 86 includes oval portion 88 , the periphery of which is connected to planar portion 87 of ceiling 86 by wall 90 , having a height slightly greater than the thickness of plate 10 . plate 10 fits into a cavity formed by oval portion 88 and wall 90 and is held in place by transparent adhesive tape 91 , which forms the floor of the cavity . the unexposed , bottom face of plate 10 abuts tape 91 . extending upwardly from ceiling portion 88 is bulbous portion 92 of cover 74 . bulbous portion 92 is shaped for ( 1 ) receiving leg 22 and hook 24 of hanger structure 16 and ( 2 ) in such a way as to facilitate insertion of the leg and hook portions of the hanger structure , as well as to hold the leg and hook portions in place . to this end , bulbous portion 92 includes ( 1 ) sidewalls 94 that taper toward each other and away from ceiling portion 88 , ( 2 ) floor 96 , and ( 3 ) ceiling 98 ; floor 96 and ceiling 98 extend away from ceiling portion 88 . bulbous portion 92 also includes a front wall including ( 1 ) segment 100 that extends upwardly at an oblique angle from floor 96 ( fig5 ) and ( 2 ) portion 102 that extends upwardly from ceiling 98 . wall portions 100 and 102 meet at apex 104 at a distance sufficiently far from roof portion 88 to accommodate leg 22 and hook 24 , so a portion of hook 24 bears against a segment of wall portion 100 to assist in holding hanger structure 16 in place . the exposed face of plate 10 bears against wall portion 88 , which has a shape and size substantially the same as , but slightly larger , than the oval shape of plate 10 . to assist in holding hanger structure 16 and plate 10 in place in the assembled condition , as illustrated in fig2 b , flange 84 includes tongue 106 ( fig5 ) that extends from the remainder of container 74 toward opening 70 . tongue 106 includes a central elongated opening 108 , having length , width , and thickness dimensions to snugly receive arm 20 when plate 10 is located in the chamber formed by wall 90 , oval ceiling portion 88 and tape 91 . wall 110 ( fig6 ), having a height slightly greater than the thickness of arm 20 , extends from the edges of tongue 106 , where opening 108 is formed . at the top of wall 110 is ceiling 112 that is connected to the portion of wall 82 from which tongue 106 extends and through which an opening 114 is thereby provided in a portion of wall 82 connected to tongue 106 . arm 20 is located in opening 114 . tongue 106 , opening 108 , wall 110 , ceiling 112 and the portion of panel 68 that abuts opening 108 form a chamber ( i . e ., pocket ) in which arm 20 snugly fits . the snug fit of arm 20 in the pocket , in combination with the snug fit of plate 10 against oval ceiling portion 88 , as well as tape 91 , and the snug fit of hook 24 against roof portion 100 of bulbous portion 92 of cover 74 hold plate 10 and hanger structure 16 firmly in place in the assembled condition . in the assembled condition , plate 10 , arm 20 , and leg 22 extend in planes substantially parallel to planar surface 72 , and shoulder 18 extends substantially at a right angle to planar surface 72 . the presentation is enhanced by the prominent position of nails 28 in cover 74 . nails 28 are located immediately below the planar portion of transparent ceiling 86 , where the nails can easily be seen by a prospective purchaser . nails 28 are located in chamber 120 ( fig4 , 5 , and 7 ), including elongated parallel walls 122 and sidewalls 124 that extend at right angles to walls 122 . the central portions of elongated walls 122 have a height slightly greater than the diameters of the elongated portions 126 of nails 28 , while walls 124 and the end portions of elongated walls 122 have a height slightly greater than the diameters of heads 128 of nails 28 . chamber 120 also includes roof 130 that is an integral part of cover 74 , as are walls 122 and 124 . chamber 120 further includes floor 132 , formed of transparent cellophane adhesive tape that is attached to the underside of the planar portion of ceiling 86 of cover 74 , after nails 28 have been inserted into chamber 120 between walls 122 and 124 , against ceiling 130 while cover 74 is in an inverted position , prior to plate 10 and hanger structure 16 being inserted into the chamber including cover 74 . the prominent location of nails 28 and the location of the nails in chamber 120 enable the prospective purchaser to realize easily what is involved in securing the picture hanger in place . in addition , the person assembling the picture hanger can leave the nails in place in chamber 120 after removing plate 10 and hanger structure 16 in the assembled condition from the pocket including cover 74 and backing 68 of point - of - sale device 64 . hence , the likelihood of nails 28 being misplaced or lost is considerably reduced . panel 68 , in addition to carrying plate 10 , hanger structure 16 , nails 28 , and container 74 , includes a text message 134 containing information about the picture hanger , as well as illustrations 136 , to assist the person assembling the picture hanger . text message 134 and illustrations 136 are accessible to the prospective purchaser even though the picture hanger remains behind the transparent cover 74 , and the prospective purchaser does not have access to the picture hanger . while a specific embodiment of the invention has been described and illustrated , variations regarding details of the embodiment specifically illustrated and described may be made without departing from the true spirit and scope of the invention as defined in the appended claims .
a point - of - sale device carries an article having plural interfitting parts that must be fitted together by a human assembler after purchase , and includes a panel for enabling the device to be presented to a prospective purchaser at a retail shop . the panel includes a container in which the interfitting parts of the article in the assembled condition are located . the container has a transparent region through which the interfitting parts , in their assembled condition , can be seen by a prospective purchaser . the point - of - sale device is mounted on a horizontally extending , elongated element carried by a pegboard .