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262 Fed.Rep. 155) District Court of the United States, Southern District of New York, October 20, 1919. Reported in "The Trade Mark Reporter" Vol 10, 1920, Pages 164 - 175. The court observed that Hubbell's plugs were readily distinguishable from those of other makes by the provision of "nicks" in the pins of Hubbell's plug pins, designed to provide retention when mated with Hubbell's receptacles, so there was no confusion as to their origin. A receptacle with a green dot is a so-called "hospital grade" device; The primary reason to use a hospital-grade receptacle at a patient bed location is to ensure that a receptacle with a greater contact tension is provided to minimize possibilities that an attachment plug supplying medical or life support equipment may be disconnected because the attachment plug slipped out of the receptacle. You will often see trains with only one pantograph but, on trains which use shoes, there are always several shoes. Electric power companies sometimes install platforms similar to this one near their power-handling facilities (transmission lines; substations). Optical fibers can be included in the stranded conductors of a transmission line, in the overhead shield wires.

Cable TV can start as low as $10/mo. • Bandwidth The effective capacity of twisted pair cable depends on several factors, including the gauge of the conductor, the length of the circuit and the spacing of the amplifiers (repeaters). 1971: Advertisements transition from 60 seconds in average length to 30 seconds. If too high a current flows, the element rises to a higher temperature and either directly melts, or else melts a soldered joint within the fuse, opening the circuit. Biological effects have been established for acute high level exposure to magnetic fields above 100 μT (1 G) (1,000 mG). It is the harbinger of an age when international difficulties will not have time to ripen into bloody results, and when, in spite of the fatuity and perveseness of rulers, war will be impossible. According to NEMA, NEMA 22 straight-blade devices are "reserved for future configurations", so no designs for this series exist and no devices have been manufactured.

NEMA 11 series devices are three wire, three-pole, non-grounding devices for 3-phase 250-volt designs and equipment parts are specified by NEMA for 20-ampere (11-20), 30-ampere (11-30), and 50-ampere (11-50) devices. The small hole near the end of the power (non-ground) blades of some NEMA plugs is used for convenience in manufacturing; if present, it must be of specified diameter and position. Multiple sources and loads can be connected to the transmission system and they must be controlled to provide orderly transfer of power. To be listed, the device must meet testing and other requirements set by a listing agency such as Underwriters Laboratories (UL), SGS North America, Intertek (Formerly ETL), Canadian Standards Association (CSA), or FM Approvals (FM). This was set out as a formal strategic goal, which became known as the All Red Line. These devices provide point-of-use protection and are the last line of defense in a whole-house surge protection network. IEEE Global History Network. Briggs, Asa and Burke, Peter: "A Social History of the Media: From Gutenberg to the Internet", what is electric cable p110.

Ronnie J. Phillips, "Digital technology and institutional change from the gilded age to modern times: The impact of the telegraph and the internet" Archived 8 August 2020 at the Wayback Machine, Journal of Economic Issues, vol. Morris Rossabi, From Yuan to Modern China and Mongolia, p. Christopher H. Sterling, "Great Wall of China", pp. Christopher H. Sterling, Encyclopedia of Radio 3-Volume Set, Routledge - 2004, p. Christopher Cooper, The Truth About Tesla: The Myth of the Lone Genius in the History of Innovation, Race Point Publishing, 2015, p. Christopher Cooper, The Truth About Tesla: The Myth of the Lone Genius in the History of Innovation, Race Point Publishing, 2015, pp. Anton A. Huurdeman, The Worldwide History of Telecommunications, p. Anton A. Huurdeman, The Worldwide History of Telecommunications (2003) pp. Lewis Coe, The Telegraph: A History of Morse's Invention and Its Predecessors in the United States, McFarland, p. Lewis Coe, The Telegraph: A History of Morse's Invention and Its Predecessors in the United States, pp. Ken Beauchamp, History of Technology, p.