File:Cathode ray oscilloscope, Type 208-B, Allen B. DuMont Laboratories, Passaic NJ, c. 1943 - Putnam Gallery - Harvard University - DSC08096.jpg
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![File:Cathode ray oscilloscope, Type 208-B, Allen B. DuMont Laboratories, Passaic NJ, c. 1943 - Putnam Gallery - Harvard University - DSC08096.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Cathode_ray_oscilloscope%2C_Type_208-B%2C_Allen_B._DuMont_Laboratories%2C_Passaic_NJ%2C_c._1943_-_Putnam_Gallery_-_Harvard_University_-_DSC08096.jpg/386px-Cathode_ray_oscilloscope%2C_Type_208-B%2C_Allen_B._DuMont_Laboratories%2C_Passaic_NJ%2C_c._1943_-_Putnam_Gallery_-_Harvard_University_-_DSC08096.jpg?20221228012020)
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