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2
Non-Commercial Use
2
Category
Industrial Metrology
2
Maker
F. Holden Co.
1
Smith, Ciceri
1
Object type
calliper micrometer
1
lever micrometer comparator
1
Place
London
2
Edinburgh
1
London, England, United Kingdom
1
London, Greater London, England, United Kingdom
1
Material
steel and brass
2
Date
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digital readout micrometer
pat 1893.
'Holdens' minimeter comparator
1917-1919
