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No CopyrightThis item is no longer under copyright in Australia and is in the public domain. It may be used freely. When using or sharing this item attribution should be given to the City of Sydney Archives.
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National Standard Laboratory (01/01/1944), [A-00546451]. City of Sydney Archives, accessed 19 Aug 2025, https://archives.cityofsydney.nsw.gov.au/nodes/view/1229749