bit sub

bit sub

[′bit ‚səb]
(petroleum engineering)
A sub designed to be inserted between the drill collar and the bit.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
The resustored in the first latch(Q5) of the 4 bit sub shift register #2.