Please use this identifier to cite or link to this item: http://egyankosh.ac.in//handle/123456789/33142
Title: Unit-9 Standards, Patents, Trade Catalogues etc.
Issue Date: 2017
Publisher: IGNOU
URI: http://hdl.handle.net/123456789/33142
Appears in Collections:Block-2 Categories of Referece Sources - Part 1

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