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  2. Hex key - Wikipedia

    en.wikipedia.org/wiki/Hex_key

    A hex key (also, hex wrench, Allen key and Allen wrench or Inbus) is a simple driver for bolts or screws that have heads with internal hexagonal recesses ( sockets ). Hex keys are formed from a single piece of hard hexagonal steel rod, having blunt ends that fit snugly into similarly shaped screw sockets. The rods are bent to 90º, forming two ...

  3. Allen (brand) - Wikipedia

    en.wikipedia.org/wiki/Allen_(brand)

    Originally named Allen Manufacturing Company, the business produced hexagonal set screws and wrenches to fasten them. The terms "Allen wrench" (American English) and "Allen key" (British English) [ 3] are derived from the Allen brand name and refer to the generic product category "hex keys". W.G. Allen [ 4] filed the first related patent in ...

  4. Operational amplifier - Wikipedia

    en.wikipedia.org/wiki/Operational_amplifier

    After 10× amplification, the output should be a 10 V, 100 kHz sawtooth, with a corresponding slew rate of 1 V per microsecond. However, the classic 741 op amp has a 0.5 V per microsecond slew rate specification so that its output can rise to no more than 5 V in the sawtooth's 10-microsecond period.

  5. Tube socket - Wikipedia

    en.wikipedia.org/wiki/Tube_socket

    Keying by omitting a pin is also used in 8- (subminiature), 10-, and 12-pin tubes (a variant 10-pin form, "Noval+1", is basically a nine-pin socket with an added center contact). As with loctal tubes, the pins of miniature tube are stiff wires protruding through the bottom of the glass envelope which plug directly into the socket.

  6. Programmable logic controller - Wikipedia

    en.wikipedia.org/wiki/Programmable_logic_controller

    A programmable logic controller (PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.

  7. Dual in-line package - Wikipedia

    en.wikipedia.org/wiki/Dual_in-line_package

    Eight-contact DIP switch with 0.3" wide 16-pin (DIP16N) footprint. In microelectronics, a dual in-line package ( DIP or DIL) [ 1] is an electronic component package with a rectangular housing and two parallel rows of electrical connecting pins. The package may be through-hole mounted to a printed circuit board (PCB) or inserted in a socket.

  8. Ethan Allen (armsmaker) - Wikipedia

    en.wikipedia.org/wiki/Ethan_Allen_(armsmaker)

    Ethan Allen (armsmaker) 6 shot .36 caliber percussion pepperbox by Allen & Thurber (Worcester). Barrel flute bears 1837 patent date, hammer is marked "Allen's Patent". Ethan Allen (September 2, 1808 – January 7, 1871) was a major American arms maker from Massachusetts. He is unrelated to the revolutionary Ethan Allen.

  9. Lock and key - Wikipedia

    en.wikipedia.org/wiki/Lock_and_key

    A typical modern padlock and its keys. A lock is a mechanical or electronic fastening device that is released by a physical object (such as a key, keycard, fingerprint, RFID card, security token or coin), by supplying secret information (such as a number or letter permutation or password), by a combination thereof, or it may only be able to be opened from one side, such as a door chain.