File:Tube and beam control knobs of Dual-beam Cathode Ray Oscillograph 322-A, DuMont Laboratories, c. 1950s.jpg
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![File:Tube and beam control knobs of Dual-beam Cathode Ray Oscillograph 322-A, DuMont Laboratories, c. 1950s.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Tube_and_beam_control_knobs_of_Dual-beam_Cathode_Ray_Oscillograph_322-A%2C_DuMont_Laboratories%2C_c._1950s.jpg/754px-Tube_and_beam_control_knobs_of_Dual-beam_Cathode_Ray_Oscillograph_322-A%2C_DuMont_Laboratories%2C_c._1950s.jpg?20230102203245)
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