It is in the Tape Recording Magazine for April 1960:
COMPACT EXECUTIVE A new pocket -sized, transistorized, Executive TR-10 recorder and dictating ma- chine is now available. This compact instrument weighs only 31/2 pounds; it operates on penlite batteries or on AC current or car battery; it has six transistors and one diode; it is dual track and operating speeds are 3;4 and IN ips. Other features in - elude built-in speaker and amplifier, safety interlock button, and remote control jack. Uses 3" tape reels; a single knob controls all operations, and it offers uo to a full hour of recording. The Executive TR-10 costs S 169.95. Literature can be obtained from Scopus. Inc., -í(hí Fourth Ave., New York. N. Y.