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Description: |
| The patent addresses a spring on a self-adjusting wrench covered by earlier patents no. 1,533,602 (April 14, 1925), and no. 1,634,908 (July 5, 1927), issued to Mead & E. E. Lynch. Depending on when they were manufactured, MASTERENCH self adjusting wrenches cite one or more patents; the current patent, the two mentioned in the specifications, and additional patents issued Nov. 1, 1932 (no. 1,885,616), and Jan. 21, 1936 (no. 2,028,406).
See also Walter M. Heller patent no. 1,763,353 for a fire hose and hydrant wrench based on this design. |
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