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1917 – Black & Decker invented and patented the hand-held electric drill with a pistol grip and trigger switch. [3] [7] –– For many decades the director of design was Glenn Calvin Wilhide, a friend of Walter Gropius and other industrial designers of the day. Wilhide filed many US patents for Black & Decker.
A Glock switch functions by applying force to a semi-automatic pistol's trigger bar to prevent it from limiting fire to one round of ammunition per trigger pull. [5] [6] Normally, in a semiautomatic pistol, after firing, the trigger bar catches the firing pin until the trigger is released, but when depressed by the switch it does not catch.
Heckler & Koch VP70 pistol with a push-button safety (cross bolt trigger block) at the back of the trigger guard. The most common form of safety mechanism is a switch, button or lever that when set to the "safe" position, prevents the firing of a firearm. [1]
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All thyristors are regenerative switching devices, and they cannot operate in linear manner. Thus, a transistor is not a thyristor even though it can operate like a switch (ON-OFF). The transistor is not inherently an ON-OFF device, and it is possible for a transistor to operate linearly.
In 1917 the first trigger-switch, pistol-grip portable drill was patented by Black & Decker. [20] This was the start of the modern drill era. Over the last century the electric drill has been created in a variety of types and multiple sizes for an assortment of specific uses.
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