| 摘要 |
A fixture for positioning at least two articles in a predetermined relationship generally consisting of a body having at least two abutment surfaces disposed in such predetermined relationship, each of the surfaces having a port closeable upon positioning one of the articles on the surface in abutting relation therewith, in a passageway communicating with the port and communicable with a vacuum source; and a valve disposed in the passageway normally disposed in a closed position and operable to open upon positioning such article on such surface in abutting relation therewith.
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