Archive pages from the 'norcim radio control history and electronics' website, 

APPENDIX 3

Typical Micron radio control Advertising mid 70s to early 80s.

Usually seen in RCM&E and Radio Modeller magazines monthly.

Note, very early Micron systems, centered all servos and closed throttle if the transmitter signal was lost.  High wing models had a chance of surviving if they flew out of range).

A BIG THANKS TO THE 'VRHC' WEBSITE FOR USE OF THEIR COLLECTION OF RADIO GEAR ADVERTISING HISTORY. LOTS OF R/C HELICOPTER INFO THERE TOO.   https://www.vrhc.co.uk/index.php/en/