Automatic slide film exchanging unit

Photography and optical equipment – Projector or viewer – Element or attachment

Patent

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Patent

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D03229793

REFERENCES:
patent: D206032 (1966-10-01), Baring
patent: D211911 (1968-08-01), Hansen
patent: D244023 (1977-04-01), Wilsch et al.
patent: D277105 (1985-01-01), sterlin
patent: 3238653 (1966-03-01), Wiklund

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