formed in integral series but easily separable

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    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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    Sleeve anchor for screw

    • Patent number 4,978,265
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    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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    3199398

    • Patent number 3,199,398
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    1518470

    • Patent number 1,518,470
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