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2. Trimmer (electronics) - Wikipedia

   en.wikipedia.org/wiki/Trimmer_(electronics)

   Trimmer potentiometers or "trimpots" A trimmer, or preset, is a miniature adjustable electrical component. It is meant to be set correctly when installed in some device, and never seen or adjusted by the device's user. Trimmers can be variable resistors (potentiometers), variable capacitors, or trimmable inductors.

3. Sikorsky H-19 Chickasaw - Wikipedia

   en.wikipedia.org/wiki/Sikorsky_H-19_Chickasaw

   H-19 at National Museum of the United States Air Force, showing unusual mounting of engine. Major innovations implemented on the H-19 were the forward placement of the engine below the crew compartment and in front of the main cabin, the use of offset flapping hinges located nine inches (230 mm) from the center of the rotor, and the use of hydraulic servos for the main rotor controls.

4. Lockheed HC-130 - Wikipedia

   en.wikipedia.org/wiki/Lockheed_HC-130

   USCG HC-130H flying in Hawaii, 2015. A USAF HC-130P refuels an HH-3E Jolly Green Giant, 1968. USCG HC-130H on International Ice Patrol duties. The Lockheed HC-130 is an extended-range, search and rescue (SAR)/combat search and rescue (CSAR) version of the C-130 Hercules military transport aircraft, with two different versions operated by two separate services in the U.S. armed forces.