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US Patent: 441,777
Explorer's Instrument
Patentee:
John L. Simmons (exact or similar names) - Duluth, St. Louis County, MN

USPTO Classifications:
33/271

Tool Categories:
specialty tools : magnetic compasses

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. M. Simpson
Q. J. Bunting
J. Henry Kaiser
Austin Terryberry
Patent Dates:
Applied: May 07, 1890
Granted: Dec. 02, 1890

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
Description:
C. M. Simpson - patent attorney

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