country obtained from

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  Canada (1) France (1) Netherlands (4) United Kingdom (1) United States (3)

graduation

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  deg (6) gon / grad (2)

fine reading

•  drum micrometer (4)
•  scale micrometer (1)
•  vernier (single) (2)

Type of use

•  Education (1)
•  Navigation (4)
•  Survey (6)

Material

•  Aluminium (4)
•  Brass (8)
•  Steel (1)

image direction

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  upright (6)

Brand

•  Bosun (1)
•  C. Plath (7)
•  Cruver Mfg Co (1)
•  Davis Instruments (3)
•  de Koningh (2)
•  Ebbco (4)
•  Einson Freeman Co (1)
•  F. Barker and Son (1)
•  H. Haecke (1)
•  Heath and Co (1)
•  Henry Hughes and Son (2)
•  Ilon Industries (2)
•  J. Coombes (1)
•  Lafayette Instruments (1)
•  Lefevbre Poulin (1)
•  Observator (4)
•  Tamaya Technics (1)
•  Things of Science (1)
•  VEB Freiberger (4)
•  Weems and Plath (2)
•  Welch Scientific Company (1)