• The Gazette of the Republic of Sri Lanka (Ceylon), Part - I : Section - III, Trade Mark and Patent Notices, No. 160, Friday April 18, 1975 

  Government of Ceylon (Ceylon Government Printer, 1975-04-18)
• The Gazette of the Republic of Sri Lanka (Ceylon), Part - I : Section - III, Trade Mark and Patent Notices, No. 158, Friday April 04, 1975 

  Government of Ceylon (Ceylon Government Printer, 1975-04-04)
• The Gazette of the Republic of Sri Lanka (Ceylon), Part - I : Section - III, Trade Mark and Patent Notices, No. 157, Thursday March, 27 , 1975 

  Government of Ceylon (Ceylon Government Printer, 1975-03-27)
• The Gazette of the Republic of Sri Lanka (Ceylon), Part - I : Section - III, Trade Mark and Patent Notices, No. 155, Friday March 14, 1975 

  Government of Ceylon (Ceylon Government Printer, 1975-03-14)
• The Gazette of the Republic of Sri Lanka (Ceylon), Part - I : Section - III, Trade Mark and Patent Notices, No. 154, Friday March 07 , 1975 

  Government of Ceylon (Ceylon Government Printer, 1975-03-07)

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