| 摘要 |
A BOTTOM PLATE FOR AN H-28 MACHINE IS SECURED TO A POST WHICH IS RECEIVED WITHIN A HOLLOW STUD AND SITS ON A BALL BEARING SUPPORTED WITHIN THE STUD. THE POST WHICH HAS AN ANNULAR GROOVE COOPERATES WITH A PLURALITY OF LOCKING PINS WHICH CAN BE HELD IN OPERATIVE RELATION WITH THE POST GROOVE OR RELEASED BY A ROTATABLE COLLAR.
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