Three letters to James Cantlie regarding his invention and specification for a Protective Face Mask (gas mask), from Allen and Hanbury's Ltd, makers of surgical instruments and sundries, and Southall Brothers and Barclay Ltd, manufacturing chemists

Date:
May 1915 - Jun 1915
Reference:
MS.7938/15
Part of:
Cantlie, Sir James, F.R.C.S. (1851-1926)
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