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Since 1958, the meter of the IL-58 lines has been manufactured by the Slavgorod plant of radio equipment. Since 1962, the device produced and Barnaul radio plant. The meter line "IL-58" is used to measure the parameters of radio transmission lines. The device was produced in a portable version with power from the mains, as well as in the stationary version, built into the rack of radio centers. In the last photo just such an option. Both plants manufactured the IL-58 until 1973.