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Head Office - Vacuum Cleaning Machinery in operation on ground floor - 5 September 1916 (5/09/1916). Reserve Bank of Australia Unreserved, accessed 25/01/2025, https://unreserved.rba.gov.au/nodes/view/85239, https://doi.org/10.47688/RBA_Archives_PN-000898
https://doi.org/10.47688/RBA_Archives_PN-000898