law: Factories Act, 1948 
  45. First-aid appliances 
  (1) There shall in every factory be provided and maintained so
  
  as to be readily accessible during all working hours first-aid boxes or
  
  cupboards, equipped with the prescribed contents, and the number of such boxes
  
  or cupboards to be provided and maintained shall not be less than one for every
  
  one hundred and fifty workers ordinarily employed 3[at any one time]
  
  in the factory.
   64  [(2) Nothing except the prescribed contents shall be kept
  
  in a first-aid box or cupboard.
  (3) Each first-aid box or cupboard shall be kept in the charge
  
  of a separate responsible person 65[who holds a certificate in
  
  first-aid treatment recognized by the State Government] and who shall always be
  
  readily available during the working hours of the factory].
   66  [(4)] In every factory wherein more than five hundred
  
  workers are 67[ordinarily employed] there shall be provided and
  
  maintained an ambulance room of the prescribed size, containing the prescribed
  
  equipment and in the charge of such medical and nursing staff as may be
  
  prescribed 68[and those facilities shall always be made readily
  
  available during the working hours of the factory].