| 摘要 |
A brake or clutch for extreme heavy duty may have a friction material which is substantially all carbon and which, for periods of disengagement, is free floating rotationally between a pair of solid or segmented metal members. Said metal members may each rotate, or one may rotate while the other does not rotate. Axially short means may support the friction material and be used to serve as a visible warning of wear. Beryllium is a preferred opposing surface material when used with friction material which is substantially all carbon.
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