Keeping track of what frequency is in use was (and still is) an important part of the safety measures at every RC club field and flying event. To do so, many clubs used a board with attached clothes pins marked with the frequency number. The clothes pin would hold the member’s AMA card who was flying on that frequency, therefore letting everyone else know that the frequency wasn’t available. The Manned Spacecraft RC Club, made and used these markers in the 1960s and early 1970s – at least until their name changed to the Johnson Space Center RC Club in 1973.
Thank you to the JSCRCC for the donation!
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