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Not exactly sure what this things purpose was. This powers on and the phone dial gets a response and moves the dial. No further testing done. Includes unit shown no other accessories, no manuals etc. Sold as is no returns.
Below is the companies description I located online and copied.
Series D extra capacity system 24 CONTROL FUNCTIONS FEATURES SPECIFICATIONS Control Unit - OD Designed for those stations needing the utmost in system capacity, flexibility and reliability. For use with standard accessories to provide up to 24 meter readings and 25 two-direction control functions. Recommended for larger stations with more than one transmitter or other situations requiring a large capacity system. A D.C. system designed on proven dial telephone principles. Operates without vacuum tubes, amplifiers, oscillators or tuned circuits. Lowest telephone line rental and lowest power consumption. Fully accessible with drop down panels. Reserve capacity for future needs built into basic units. Adaptable to any transmitter at minimum cost. Provision for checking metering circuit calibration at control point. 19" x 83/4" x 81/2 deep. Transmitter Unit -1D 19" x 101/2" x 81/2" deep. Power - each unit Function Indication Panels Supplied Telephone Line 100 -130 volts 50/60 cycles, 25 VA or less. By illuminated drum mounted on stepper. Standard RETMA rack slotting, umbergray. 25' plug in transmitter interconnecting cables. 2 instruction manuals. Individual interconnection diagram prepared for each customer Two inexpensive signal circuit lines required; max. D.C. loop resistance 4000 ohms. hundreds of satisfied customers vouch for vu systems.
