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US Patent: 2,543,151
Combination Plug and Agitator Crank
Henry L. Cerniak - Chicago, IL

USPTO Classifications:
220/212, 220/735, 366/349, 366/605, 74/545

Tool Categories:
wrenches : wrench combination tools

National Steel Container Corporation - Chicago, IL

National Steel Container Corporation - Chicago, IL


Patent Dates:
Applied: Jul. 28, 1948
Granted: Feb. 27, 1951

Patent Pictures: [ 1 | 2 ]
Henry L. Cerniak Pat. Feb. 27, 1951
USPTO pdf tiff
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The tool looks exactly like the patent drawing; it is marked "PAT. 254151" and "ONLY USE WRENCH TO OPEN OR CLOSE." Some include the manufacturer name "NATIONAL STEEL CONTAINER CORP."

This tool was used to operate an internal agitator in metal drums used to ship liquid mixtures that would settle or separate during shipment and storage, and to seal the opening providing access to the agitator shaft.

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