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  1. 1
    Apparatus for propelling a carriage along the length of purlins of a roof structure

    Apparatus for propelling a carriage along the length of purlins of a roof structure von NEIFER DON ALBERT, ABNEY ERNEST CRAIG, MARTIN JAMES ALLEN

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  2. 2
    Electrical controller for roofing apparatus

    Electrical controller for roofing apparatus von NEIFER, DON ALBERT, ABNEY, ERNEST CRAIG, WAUGH, MARK RICHARD

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  3. 3
    Guardrail system for an apparatus movable along a roof structure

    Guardrail system for an apparatus movable along a roof structure von PLANT CLINTON ALAN, WENRICK DENNIS K, NEIFER DON ALBERT, ABNEY ERNEST CRAIG

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