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  1. Copilot Answer
    Usage and design

    Robertson screws are commonplace in Canada, though they have been used in other countries and are becoming much … See more

    History

    The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent cove… See more

    Combination screws for electrical applications

    Many screws used in electrical applications (for example, a typical NEMA 5-15R, breaker screws, and conduit screws) use a combination of a slotted/Phillips/Robertson screw head. A few tool manufacturers make bits t… See more