US Patent: 1,640,570
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| Power hammer
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Patentee:
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| George E. Hieber (exact or similar names) - Cincinnati, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 20, 1925 |
| Granted: |
Aug. 30, 1927 |
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Jeff Joslin
Vintage Machinery entry for Concrete Surfacing Machinery Co.
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Description: |
| This power hammer is operated by flexible shaft. The assignee sold a concrete surfacer that used a motor carried by a shoulder strap and feeding a cutter-head by flexible shaft. |
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