| 摘要 |
<p>1394953 Templet C G MARTINEZ 24 Oct 1973 [20 Dec 1972] 49474/73 Heading B6P A drawing instrument includes a circular templet having recesses in its periphery to permit engagement with a ring having complementary flanges for aligning with the recesses. The ring is rotatably mounted on a support member having a circular opening concentric with the ring, when mounted thereon. The support member has bearings which hold the ring and support member concentric and may be shaped to prevent axial separation of the ring and support member. The templet has at least one hole alignable with at least one hole in the support member to permit a pin prevent their relative rotation.</p> |
