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Record
GB 0809 Ross - Ross, Col Sir Ronald (1857-1932)
159 - Material on Ross' inventions including ear plugs and a clinical automatic thermometer
01 - Material on the invention of ear plugs by Ross
Ref No
GB 0809 Ross/159/01/35
Level
Item
Title
Letter from Charles Baker, Scientific instrument makers
Date
19/9/1911
Description
They have sold a few ear clips and 'one or two customers have tried and returned them'. Suggest that an improved design is needed for them to be better received and ask for suggestions
AccessStatus
Open
Language
English
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