| 摘要 |
The pincers comprise of two symmetrical parts joined at the axes of symmetry by a conventional elastic element passing through opposed hemispherical porjections. One part has crown-shaped projection (6) on the inner face, compatible wtih annular recess in the other part. Each part diverges from the other in the peripheral zones, allowing pressure applied to any part of the zone to produce max. sepn. at the opposite end, between the gripping points.
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