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| All Patents in class 279/19.4 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 951,013 | Mar. 01, 1910 | V.E. Lane | Tool Holder for Pneumatic Hammers | ||
| 1,706,460 | Mar. 26, 1929 | R.A. Norling | Chisel retainer for chipping hammers | ||