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The Clapper is a sound-activated electrical switch, [1] sold since 1984 by San Francisco, California based Joseph Enterprises, Inc. Joseph Pedott marketed the clapper with the slogan "Clap On! Clap Off! The Clapper!". [2] The Clapper plugs into a U.S.-type electrical outlet, and allows control of up to two devices plugged into the Clapper. [3]
The Clapper, whose slogan is "Clap On! Clap Off!", was first sold to the public on September 1, 1985. A trademark was filed on the brand name "Clapper" with the U.S. Patent and Trademark Office on July 9, 1986. [4] A design patent was applied for on November 13, 1985, which was issued as D299127 on December 27, 1988. [5]
The product: The Clapper The price: $24.95 plus $6.95 shipping and handling for a total of $31.98. The claims: It turns up to two plug-in lights or equipment on and off with claps. The Buy-o-meter ...
GE Oil & Gas acquires Vetco Gray for US$1.9 billion. [19] [20] 2007 GE Plastics is sold to SABIC for US$11.6 billion. [21] 2008 GE Oil & Gas acquires Hydril Pressure & Control for US$1.12 billion from Tenaris, who retains possession of Hydril Premium Connections. [22] [23] 2008 GE Co. acquires Vital Signs Inc. for US$860 million [24] 2009
[29] [30] The clapper or tongue is manufactured in a similar process as the bell. Special care is given to cast the clapper at the proper weight, as a clapper that is too light will not bring out the true tones of the bell and a heavy clapper might cause the bell to crack. [15]
German scientist Otto von Guericke invented a device that creates static electricity. This is the first ever electric generator. 1705: English scientist Francis Hauksbee made a glass ball that glowed when spun and rubbed with the hand 1720: English scientist Stephen Gray made the distinction between insulators and conductors 1745
Vibrating "hammer" interrupters were invented by Johann Philipp Wagner (1839) and Christian Ernst Neeff (1847), and was developed into a buzzer by Froment (1847). [ 5 ] [ 6 ] John Mirand around 1850 added a clapper and gong to make the standard electric bell [ 5 ] [ 6 ] for use as a telegraph sounder .
The bell will eventually stop when the dry piles have distributed their charges equally if the clapper does not wear out first. [5] [6] The Bell has produced approximately 10 billion rings since 1840 and holds the Guinness World Record as "the world's most durable battery [delivering] ceaseless tintinnabulation". [2]