law: Industrial Employment (Standing Orders) Act, 1946
  10. Duration and modification of standing orders
  (1) Standing orders finally certified under this Act shall not,
  
  except on agreement between the employer and the workmen, 9[or a
  
  trade union or other representative body of the workmen] be liable to be
  
  modification until the expiry of six months from the date on which the standing
  
  orders or the last modifications thereof came into operation.
   10  [(2) Subject to the provisions of sub-section (1), an
  
  employer or workman 9[or a trade union or other representative body
  
  of the workmen may apply to the Certifying Officer to have the standing orders
  
  modified and such application shall be accompanied by five copies of the
  
  modifications proposed to be made, and where such modifications are proposed to
  
  be made by agreement between the employer and the workmen 9[or a
  
  trade union or other representative body of the workmen], a certified copy of
  
  that agreement shall be filed along with the application.]
  (3) The foregoing provisions of this Act shall apply in respect
  
  of an application under sub-section (2) as they apply to the certification of
  
  the first standing orders.
   3  [(4)Nothing contained in sub-section (2) shall apply to an
  
  industrial establishment in respect of which the appropriate government is the
  
  Government of the State of Gujarat or the Government of the State of
  
  Maharashtra.]