| 摘要 |
Apparatus for smoothing, cutting, grinding and polishing with a disc, comprise a disc drive having a head including a disc retainer member insertable for formfitting interlock into an oblong central hole of the disc. The head is undercut by grooves cooperating with the disc and delimiting means forming a bayonet-type interlock for rotation in a first sense as well as for rotation in an opposite second sense.
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