tipped to vertical position of its axis because of the usual, but when necessary hard pulling upon the bit conical control block against which the spindle bears. will bring into service the check bit, which .will put Therefore, it is constrained to follow the gyratory a severe strain on the… … COMBINATI0N DRIVING AND CHECK BIT. ber which has about the same specific gravity as water, may readily be dipped into the water when desired. and since the ball is exposed to the inlet pressure of the mal or driver. A very advantageous feature of the im- water through the openings in the top and…
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