law: Companies Act, 1956
  Sec 136    -     Copy
  
  of instrument creating charge to be kept by company at registered office. 
  Every company shall cause a copy of every instrument creating
  
  any charge requiring registration under this Part to be kept at the registered
  
  office of the company :
  Provided  that, in the case of a series of uniform
  
  debentures, a copy of one debenture of the series shall be sufficient .