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Clag was first trademarked in 1898 by Joseph Angus, manufacturer, of 216 Nicholson Street, North Fitzroy, Melbourne. The National Archives of Australia holds the original trademark application - a digitised version is available online (see References). The exact composition of the original paste is unknown but is thought to have been starch-based.
Angus, Joseph. Application for Trade Mark titled Clag in respect of adhesive paste. Application for trademark. NAA: Series number A11731, Control symbol 5744. Item barcode 5002761. See NAA online catalogue record
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