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The slightly different shape of bantam plugs is also less likely to cause shorting as they are plugged in.
Less commonly used sizes, both diameters and lengths, are also available from some manufacturers, and are used when it is desired to restrict the availability of matching connectors, such as 0.210 inch inside diameter jacks for fire safety communication jacks in public buildings, the same size found in discontinued Bell & Howell 16 mm projector speaker jacks.
The current form of the switchboard-plug was patented prior to 1902, when Henry Pl. The roughly half-sized version of the original, the 3.5 mm connector, which is the most commonly used in portable application today, was popularized by the Sony EFM-117J radio which was released in 1964.
A pair of phone connectors: A plug (right) is inserted in a socket (jack, left) Note the flat open contact spring parallel to and inside the tip contact spring.
When the plug is removed, those contacts close to connect a circuit; such a connection is said to be "normal".
The phone connector was invented for use in telephone switchboards in the 19th century and is still widely used.
The phone connector is cylindrical in shape, with a grooved tip to retain it.