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The diamond-shaped tower was patented by Nicholas Gerten and Ralph Jenner for Blaw-Knox July 29, 1930. [5] and was one of the first mast radiators.[1] [6] Previous antennas for medium and longwave broadcasting usually consisted of wires strung between masts, but in the Blaw-Knox antenna, as in modern AM broadcasting mast radiators, the metal mast structure functioned as the antenna. [1]
The cellular structure in a matrix reduces density, increasing thermal and acoustic insulation, while increasing relative stiffness of the original polymer. Blowing agents (also known as 'pneumatogens') or related mechanisms to create holes in a matrix producing cellular materials, have been classified as follows:
In 1990, WPTT-TV and Pittsburgh's News Corporation (not affiliated with the News Corporation that owned Fox until 2013) entered into an agreement to produce a 10 p.m. newscast to air on WPTT-TV which was to begin in the summer of 1991, and would feature news anchors from WTAE-TV. After going through three owners, WPGH-TV was put up for sale ...
WPXI was the only station in Pittsburgh with such a service until KDKA-TV launched CBSN Pittsburgh as part of CBS News on March 5, 2020. [ 37 ] On April 15, 2015, WPXI became a charter affiliate of Laff on channel 11.3, bringing 11.3 live again for the first time since NBC Weather Plus shut down.
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Carrie Furnace is a former blast furnace located along the Monongahela River in the Pittsburgh area industrial town of Swissvale, Pennsylvania, and it had formed a part of the Homestead Steel Works. The Carrie Furnaces were built in 1884 and they operated until 1982. During its peak, the site produced 1,000 to 1,250 tons of iron per day. [3]
While in 1976 there were roughly 100 cellulose insulation firms with 125 plants in the US, by 1978 there were more than 350 firms with more than 500 plants 1. Cellulose insulation was produced locally by small manufacturers who purchased ready-to-operate machines and offered a cheap and easy low-tech production process.
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