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A party line (multiparty line, shared service line, party wire) is a local loop telephone circuit that is shared by multiple telephone service subscribers. [ 1 ] [ 2 ] [ 3 ] Party line systems were widely used to provide telephone service, starting with the first commercial switchboards in 1878. [ 4 ]
1962 – JBL creates the first 2-way studio monitor, using a high-frequency motor lens; 1967 - JBL creates the iconic red box logo with the exclamation (!) and white lettering. Designed by Arnold Wolfe, the president of JBL [11] 1968 – JBL launches the 3-way speaker 4310; 1969 – Sidney Harman acquires JBL
The most popular battery is the 9-volt type with taps every 1 + 1 ⁄ 2 volts that accept banana plugs. [1] A rare form of "C" battery is the bias cell , a button-size miniature battery designed to deliver a constant voltage with no current drain.
4: R: 25: X: A zinc-carbon lantern battery, consisting of 4 round "size 25" cells in series. Terminated with spring terminals. 4LR25-2: 4: L: R: 25: 2: An alkaline lantern battery, consisting of 2 parallel strings of 4 round "size 25" cells in series 6F22: 6: F: 22: A zinc-carbon rectangular battery, consisting of 6 flat "size 22" cells.
The actual voltage, matching the car battery's voltage, will be approximately 12.5 volts when dormant (less in cold conditions), approximately 14.5 volts when the engine and the alternator/generator are operating (more when cold), and may briefly drop as low as 5–6 volts during engine start due to the high temporary battery current usage. [12]
Vintage PP3-size 9-volt batteries Size comparison of batteries: D, C, AA, AAA, AAAA, 9-volt (PP3) The nine-volt battery, or 9-volt battery, is an electric battery that supplies a nominal voltage of 9 volts. Actual voltage measures 7.2 to 9.6 volts, depending on battery chemistry.