Retrieval speed controller for microfilm electric roll carrier

Equipment for production – distribution – or transformation of ene – Distribution – modification or control – Switch or casing therefor

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D03431649

REFERENCES:
patent: D210026 (1968-01-01), Kahn
patent: D217023 (1970-03-01), Warner et al.
patent: D247746 (1978-04-01), Hall
patent: D306998 (1990-04-01), Mintz et al.
patent: 4314309 (1982-02-01), Read
Light control on p. 25 of Home Furnishings Daily May 9, 1963.

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