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U (Simms)Troughton & Simms
Catalogue of Instruments, made by Troughton and Simms, Opticians, and Mathematical Instrument Makers to the Honourable Board of Ordnance, 138, Fleet Street, London
15-page catalogue, bound with Frederick W. Simms, A Treatise on the Principal Mathematical Instruments employed in Surveying, Levelling, and Astronomy ... (sixth edition; London: Messrs. Troughton and Simms, 1844).
[Unknown]
1844