| 摘要 |
Electronics circuitry for obtaining measurements of subsurface formation parameters is mounted on an elongated chassis which is removably disposed within a tubular housing. One or more sets of angularly disposed ball rollers are disposed along the length of the chassis. At least one of the ball rollers comprising each set will be of the plunger type, capable of exerting a high force level due to the preloaded compression of a plurality of disk springs. The ball rollers are angularly disposed and operatively set so as to exert restraining force upon the chassis while allowing simple insertion into the housing.
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