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  2. Schweitzer Engineering Laboratories - Wikipedia

    en.wikipedia.org/wiki/Schweitzer_Engineering...

    He sold his first product, the SEL-21, to Otter Tail Power Company in Fergus Falls, Minnesota in 1984. Otter Tail initially used the SEL-21 for its fault location and event recording functions. In 1985, SEL built its first building and employed eleven people. In 2009, SEL became 100% employee-owned under an employee stock ownership plan (ESOP).

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  5. Numerical relay - Wikipedia

    en.wikipedia.org/wiki/Numerical_relay

    50 – Instantaneous Overcurrent (N for neutral, G for ground current) 51 – Inverse Time Overcurrent (N for neutral, G from ground current) 59 – Over Voltage; 62 – Timer; 64 – Ground Fault (64F = Field Ground, 64G = Generator Ground) 67 – Directional Over Current (typically controls a 50/51 element) 79 – Reclosing Relay

  6. SELCAL - Wikipedia

    en.wikipedia.org/wiki/SELCAL

    The code is received by any aircraft receiver monitoring the radio frequency on which the SELCAL code is broadcast. A SELCAL decoder is connected to each aircraft's radio receiver. When a SELCAL decoder on an aircraft receives a signal containing its own assigned SELCAL code, it alerts the aircraft's crew by sounding a chime, activating a light ...

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  8. Fix problems signing into your AOL account - AOL Help

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  9. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    A general note applies generally and is not called out with flags. 2. Find number: "FN" meaning "find number" refers to the ordinal number that gives an ID tag to one of the constituents in a parts list (list of materials, bill of materials). Thus "fasten using FN7" refers to a fastener that is "find number" 7 in the list. FoS: feature of size