Record

Reference numberMS/377/1/4
LevelItem
TitleLetter from Herbert F Angus, H F Angus and Company, 83 Wigmore Street, Cavendish Square, London, to William Fletcher Barrett
Date16 April 1909
DescriptionAdvises against trying to take out American patents on his opthalmic apparatus. Suggests methods of promoting the devices in Britain. The leakage in the light threshold apparatus may be solved by inserting hollow wedges filed with solution.
Extent2p
FormatTypescript
Access statusOpen
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