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1. The external force required by direction-change of CM3B, CM3L, CM3V and CM3R is provided by external mechanism, which can be used for position test or stoke switch;

2. CM3PF, CM3PM, CM3PL, CM3HS, CM3HD and CM3Y are operated manually, owning control joints with several structure forms and suitable for application under different conditions;

3.It is in cut-off structure. Internal circle is sealed with good tightness, the direction-change is sensitive and lubricant is not necessary;

4. Multi-mounting method makes it convenient to install and apply;

5.The control joint of series of CM3L, CM3V, CM3R and CM3Y are made of metal which has longer service life and more reliable and steady performance.

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