Two lay steel rope type TK construction 6x19 (1+6+12)+1x19 (1+6+12). Dimensions
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Two lay steel rope type TK construction 6x37 (1+6+12+18)+1x37 (1+6+12+18). Dimensions
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Two lay steel rope, type TK, construction 6x19 (1+6+12)+1 o.c. Dimensions
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Optical bench instruments. Height of arrangement of optical axis and exit pupil
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