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US Patent: 2,074,079
Torque Measuring Wrench
Conrad Charles Bahr - New York, NY
George H. Pfefferie - Bradford, McKean County, PA

USPTO Classifications:
73/862.23, 73/862.26, 81/477, 81/62

Tool Categories:
wrenches : torque wrenches

S. R. Dresser Mfg. Co. - Bradford, McKean County, PA

Not known to have been produced

none listed

Patent Dates:
Applied: Jun. 12, 1935
Granted: Mar. 16, 1937

Patent Pictures:
Conrad C. Bahr & George H. Pfefferie patent March 16, 1937
USPTO pdf tiff
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Report data errors or omissions
The selector and internal tripping lever work to shift the primary selector to "neutral" when the chosen differential between the primary and secondary levers is reached.

The specifications discuss the wrench's operation in context of high pressure pipeline joint couplings.

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