When were slotted screws invented?

Answer Slotted screws have been around since at least the late 1400s. "The Medieval Housebook of Wolfegg Castle," published between 1475 and 1490, contains the first documentation of slotted screws being ... Read More »

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When were screws invented?

The standard flat-headed screw was invented around 700 BC, reports History For Kids. According to American Heritage, the Phillips-head screw was invented some time in the 1930s by Henry F. Phillips... Read More »

When were brass screws invented?

In 1797, Henry Maudslay invented the first industrial screw cutting lathe. His masterpiece was a brass screw seven feet long. This lathe design enabled the mass production of brass screws, and the ... Read More »

When were cell phones invented&who were they made by?

Martin Cooper invented the cell phone in 1973, and Motorola was its maker. The phone was much bigger and heavier than today's models. Called the DynaTAC, the phone did not go one sale until 10 year... Read More »

Who invented metal screws?

Screws have been used since the first century, so it is virtually impossible to know who invented them. Early screws were made of wood. In 1797, English inventor Henry Maudslay invented a machine t... Read More »