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US Patent: 829,974
Electrically Operated Mine Door Actuating Mechanism
Patentee:
John C. Lincoln - Cleveland, OH

USPTO Classifications:
187/318, 187/320, 246/129

Tool Categories:
electrical devices

Assignees:
Lincoln Co. - Cleveland, OH

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Apr. 10, 1903
Granted: Sep. 04, 1906

Patent Pictures:
USPTO pdf tiff
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