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| Patents for M. Z.L. Higgins | |||||
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| Number | Title | Classification(s) | |||
| 510,981 | Improved Combination Spanner and Locking Tool For Nuts and Bolts | 254/19, 30/167, 30/340, 7/138, 7/167, 81/119, 81/177.2, 81/181, 84/459 | |||