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  2. Tape head - Wikipedia

    en.wikipedia.org/wiki/Tape_head

    The electromagnetic arrangement of a tape head is generally similar for all types, though the physical design varies considerably depending on the application - for example videocassette recorders (VCR) use rotating heads which implement a helical scan, whereas most audio recorders have fixed heads. A head consists of a core of magnetic ...

  3. Robertson screw - Wikipedia

    en.wikipedia.org/wiki/Robertson_screw

    Screwdriver bits in different sizes for Robertson screws. When Henry Ford tried the Robertson screws, he found that they saved considerable time in Model T production. When Robertson refused to license the design, Ford realized that the supply of screws would not be guaranteed, and chose to limit their use to his Canadian division. [4] [5] [6]

  4. P. L. Robertson - Wikipedia

    en.wikipedia.org/wiki/P._L._Robertson

    Up-close image of the Robertson square-head screwdrivers. He had originally established his company, the P.L. Robertson Manufacturing Company, in Hamilton, Ontario in 1907. [ 3 ] [ 4 ] Robertson then relocated the company to produce his screws in Milton, Ontario , the following year after the town had given a $10,000 loan for the factory's ...

  5. Carlisle Completes Purchase of Thermax-Raydex Business - AOL

    www.aol.com/news/2012-12-17-carlisle-completes...

    Carlisle Completes Purchase of Thermax-Raydex Business CHARLOTTE, N.C.--(BUSINESS WIRE)-- Carlisle Companies Incorporated (NYS: CSL) announced today that it has completed the purchase of the ...

  6. Belden Completes Sale of Thermax and Raydex Businesses - AOL

    www.aol.com/news/2012-12-17-belden-completes...

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  7. Yankee screwdriver - Wikipedia

    en.wikipedia.org/wiki/Yankee_screwdriver

    The trade name "Yankee" screwdriver was first marketed by North Brothers Manufacturing Company in ≈16 April 1895, with the No. ≠130 spiral ratchet screwdriver. Yankee soon became and still is a well-known name in automatic spiral ratchet screwdrivers , with several other models, and model improvements patented by North Bros. over a 40-year ...