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US Patent: 2,404,980
Machine control means
Patentee:
Edwin A. Munschauer, Jr. - Buffalo, NY

USPTO Classifications:
188/69, 192/131R, 361/189

Tool Categories:
metalworking machines : metal shears
metalworking machines : punch presses
metalworking machines : machine tool controls

Assignees:
Niagara Machine & Tool Works - Buffalo, NY

Manufacturer:
Niagara Machine & Tool Works - Buffalo, NY

Witnesses:
Unknown

Patent Dates:
Applied: Feb. 16, 1944
Granted: Jul. 30, 1946

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Niagara Machine & Tool Works
Description:
Improved electrical two-hand controls that will not operate unless both buttons are cycled off-on. This restriction prevents an operator from disabling one button to allow faster (but less safe) operation.

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