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The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, who were owned by Philips. [1] The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between ...
1 American clockmakers. ... (1813 - 1873) Fine inlaid Vienna Regulators, Dwarf Vienna Regulator; Carl Saboy, Vienna (1875-1890) ... Vienna (1800-?) Wilhelm Bauer ...
A gas meter is a specialized flow meter, used to measure the volume of fuel gases such as natural gas and liquefied petroleum gas. Gas meters are used at residential, commercial, and industrial buildings that consume fuel gas supplied by a gas utility. Gases are more difficult to measure than liquids, because measured volumes are highly ...
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In 1971, the 1800 series was introduced as the first full line of electronic calculators. In 1973, a revolutionary electronic dot-matrix printer was introduced and sold as an OEM product. In 1974, a series of programmable calculators were introduced and quickly captured a large segment of the banking and small-business market.
More than a dozen people are missing after the 533-meter-long Juscelino Kubitschek de Oliveira bridge – which connects the northeastern cities of Estreito and Aguiarnópolis – gave way.
(The Center Square) – In 2024, the transition to renewable energy and its impact on power grid demand and reliability continued to challenge Pennsylvania lawmakers. A partisan divide in the ...
The post-war years were not kind to Waltham, however. A $211,200 net profit in 1945 flipped into a massive $411,400 loss in 1946, [64] ushering in a series of years in which the company generated red ink. A flood on the American market of inexpensive Swiss-produced timepieces was blamed for the company's dire economic straits. [63]