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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)
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)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM
