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G02B15/00—Optical objectives with means for varying the magnification
G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
G02B15/04—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by changing a part
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FR435766D1910-11-181911-10-27Perfectionnements dans les périscopes et appareils analogues
ExpiredFR435766A
(fr)