Note
Ham Radio, Nov 1969, p. 87.
Ham Radio, Dec 1969, p. 101.
Ham Radio, Jul 1970, p. 80.
– Speed: 5 to 50 WPM
– Self-completing characters with automatic character spacing.
– Pre-assembled keyboard with standard typewriter key arrangement and spacing.
– Special characters included, such as AR, SK, BT, period, comma, question mark, slant bar.
– Self-contained battery operated — two standard "D" cells. All solid state.
– Built-in side tone and speaker, fast acting relay output.
References
An article describing the Pro Key design. Ham Radio, Mar 1970, p. 26.
