发明申请
US20050183344A1 Recessed plaster collar assembly 有权
嵌入式石膏圈总成

Recessed plaster collar assembly
摘要:
A plaster collar assembly having a first ring, a second ring secured to the first ring, and a mechanism arranged at an outer periphery of at least one of the rings for axially displacing the first and second rings during rotation of the secured rings relative to each other.
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