This machine was the first open-reel tape recorder at commercial marketing in the United States, in 1947, and the first open-reel tape recorder in the world, after the Second World War. It's name was "Soundmirror", because the notional word "Magnetophon", was a priority name, it has a trade mark.

Tape speed: 19,05 cm/s
Frequency response: 60 Hz- 6 kHz