with auxiliary friction members, which may be of different type, producing the self-tightening action

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    • Patent number 4,216,848
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    2827985

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    2376828

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    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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    2369320

    • Patent number 2,369,320
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    2366094

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    2356234

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    2355720

    • Patent number 2,355,720
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    2344933

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    2338502

    • Patent number 2,338,502
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