Establishments primarily engaged in packaging, repackaging, and bottling of purchased chemical products, but not engaged in manufacturing chemicals and allied products, are classified in Wholesale or Retail Trade industries.
A phone connector, also known as phone jack, audio jack, headphone jack or jack plug, is a family of electrical connectors typically used for analog audio signals. 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. In its original audio configuration, it typically has two, three, four and, occasionally, five contacts. Three-contact versions are known as TRS
Developed by the Radio Corporation of America (RCA), the RCA connector is used in several video and audio applications. This connector is sometimes referred to as a Phono Plug. This is due to the fact that the connector's original purpose was to connect RCA phonograph players to an amplifier. The RCA connector is not, by its very nature, a 75 Ohm design. However, it is used in a multitude of 75 Ohm applications.