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US Patent: 1,428,781
Micrometer Adapter
Patentee: Henry Johnson (exact or similar names) - Portland, OR USPTO Classifications: 33/709 Tool Categories: layout tools : measurement gauges Assignees: None Manufacturer: Not known to have been produced Witnesses: C. F. Blake Peter Johnson	Patent Dates: Applied: Jan. 05, 1921 Granted: Sep. 12, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This device allows an inside micrometer to be used as an outside micrometer.

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