DuMont Laboratories
1931 - 1960
"Allan B. DuMont founded his company in 1931, known as Allen B. DuMont Laboratories, Inc. He improved cathode-ray tubes and developed the modern oscilloscope, widely used in the laboratory for the measurement and study of wave forms.
In 1937 DuMont began manufacturing the first commercial television receivers, which were based upon his improved cathode-ray tube. His company also established experimental television transmission facilities and marketed the first postwar television receivers."