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Troughton and Simms - Mathematical Instrument Works - London - Acknowledging receipt of order of 21 October 1902
Troughton and Simms - Mathematical Instrument Works - London - Acknowledging receipt of order of 21 October 1902 (27 November 1902), [UA-00016886] . Adelaide University, accessed 18/01/2026, https://connect.adelaide.edu.au/nodes/view/17083