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2. Trimmer (electronics) - Wikipedia

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

   In circuit diagrams, the symbol for a variable component is the symbol for a fixed component with a diagonal line through it terminating in an arrow head. For a preset component, the diagonal line terminates in a bar. [3]: 86, 97

3. String trimmer - Wikipedia

   en.wikipedia.org/wiki/String_trimmer

   A string trimmer, also known by the portmanteau strimmer and the trademarks Weedwacker, Weed Eater and Whipper Snipper, [1] [a] is a garden power tool for cutting grass, small weeds, and groundcover. It uses a whirling monofilament line instead of a blade, which protrudes from a rotating spindle at the end of a long shaft topped by a gasoline ...

4. Weed Eater - Wikipedia

   en.wikipedia.org/wiki/Weed_Eater

   Weed Eater is a string trimmer company founded in 1971 in Houston, Texas by George C. Ballas, Sr., the inventor of the device. The idea for the Weed Eater trimmer came to him from the spinning nylon bristles of an automatic car wash. He thought that he could come up with a similar technique to protect the bark on trees that he was trimming around.

5. File:Contacts on DeWalt 20V Max battery.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Contacts_on_DeWalt_20...

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6. Category:Electrical components - Wikipedia

   en.wikipedia.org/wiki/Category:Electrical_components

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7. George Ballas - Wikipedia

   en.wikipedia.org/wiki/George_Ballas

   Ballas got the idea for the trimmer while driving through an automatic car wash, where the rotating brushes gave him an idea. Using a tin can laced with fishing line and an edge trimmer, he tried out his idea, which worked. After some refinements, he shopped it around to several tool makers, who all rejected his invention.

8. Head-end power - Wikipedia

   en.wikipedia.org/wiki/Head-end_power

   In rail transport, head-end power (HEP), also known as electric train supply (ETS), is the electrical power distribution system on a passenger train. The power source, usually a locomotive (or a generator car) at the front or 'head' of a train, provides the electricity used for heating, lighting, electrical and other 'hotel' needs.