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X - The original connector used was a "Cannon X" from the ITT-Cannon corporation.

L - In development, they added a *L*atch to the Cannon X. They took the letter L from latch to create a title for their new "XL" cable.

R - Finally, they combined a *R*ubber compound to the contacts, and took the letter R from rubber to create the XLR.

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14y ago

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