Flask, Calibration

Production date
Circa 1960s
A tubular plastic calibration flask with a removable black rubber base with a hole at the center. The flask has a scale from 1 -45 printed on paper and marked on one side of it.
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Object detail

Production date
Circa 1960s
Production place
Subject person
Credit line
This calibration flask was used by prolific Okato inventor Charles W (Charley) Maxwell. Maxwell used it to help test his milk meter prototype that he designed during the 1960s.
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