US Patent: 2,029,753
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| Tool for lapping valve seats
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Patentee:
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| Herbert A. Berkman (exact or similar names) - Chicago, IL |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 21, 1934 |
| Granted: |
Feb. 04, 1936 |
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Patent Pictures:
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Patent 2,029,753 - edited drawing |
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Stan Schulz
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Description: |
| ZIM was marketing valve seat reamers and lappers prior to this patent; this patent is for a replaceable "face" for the tool to compensate for wear on the tool. |
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