About Development of screw
Around the first century CE, screw-shaped tools became common, however, historians do not know who invented the first. Early screws were made from wood and were used in wine presses, olive oil presses, and for pressing clothes. Metal screws and nuts used to fasten two objects together first.
In 1908, square-drive screws were invented by Canadian P. L. Robertson (1879–1951), 28 years before Henry Phillips patented his.
In the early 1930s, the Phillips head screw was invented by Oregon businessman Henry Phillips (1889–1958). Automobile manufacturers now.
Myriad types of screws have been invented to perform specific tasks. 1. A cap screwhas a convex head, usually hexagonal, designed.
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