| 摘要 |
A machine device for generating a convex surface, especially for the formation of the front surface of a cabochon, inherently symmetrical without irregularities and in a range of sizes both spheroid and ovoid, and comprising a manually operable dop-stick to which workpieces are replaceably attached to be shaped about two selectively distinct radii, by advanceably offering the workpieces into grinding engagement with an abrasive wheel.
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