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The ornamental design for hammer piston for valveless pneumatic impact device, as shown. |
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FIG. 1 is a perspective front view of a hammer piston for valveless pneumatic impact device; and
FIG. 2 is a rear perspective view thereof.
Magnusson, Karl August Valdemar
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jun 19 1975 | Atlas Copco Aktiebolag | (assignment on the face of the patent) |
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