| 摘要 |
The holding device comprises a suction cup membrane of an elastically deformable material which can be contact engaged with a glass, marble or the like plate member to define, in cooperation with the plate, a chamber sealed against leakage from the outside, a piston assembly being provided for increasing the volume of the chamber in such a way as to increase the vacuum therein and the adhesion between the plate and the suction cup membrane.
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