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US Patent: 579,951
Calipers
Patentee:
John Bystrom (exact or similar names) - Chicago, IL

USPTO Classifications:
33/558.4

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
E. H. White
George A. Milroy
Clifford N. White
Patent Dates:
Applied: Sep. 23, 1895
Granted: Apr. 06, 1897

Patent Pictures:
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