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| Patents for H. J. Walker | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,138,462 | May 04, 1915 | J.J. Eagan | Valve Spring Compressor | valve spring tools | |
| 1,266,493 | May 14, 1918 | P. Lackner | Universal Micrometer | micrometers | |