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Parts of the frame of an optic, into which the rings are fitted. | Parts of the frame of an optic, into which the rings are fitted. | ||
[[Image:Ch2_Fig10.jpg|400px | [[Image:Ch2_Fig10.jpg|400px]] | ||
Revision as of 12:00, 25 February 2009
2-2-055
Parts of the frame of an optic, into which the rings are fitted.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)