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https://thrustgear.com/relayer.pdf
http://www.yrex.com/rockets/launcher.html
https://www.rocketryforum.com/threads/simple-launch-controller-that-seems-complex.131546/
https://www.electroschematics.com/model-rocket-launch-controller/
https://onedrive.live.com/view.aspx?resid=C01405318EB9777B!91718&ithint=file%2cdocx&authkey=!AEY4pFQc6zAdVTw
https://www.nar.org/wp-content/uploads/2014/05/Multi-Pad-Launch-Controller-John-Hruby.pdf
https://www.rocketryforum.com/threads/building-launch-controllers.69242/
https://www.rocketryforum.com/threads/estes-pro-series-ii-launch-controller-disassembly-and-modification.148343/
https://narhams.org/library/tech/012-RelayLauncher.pdf
https://www.prusaprinters.org/prints/7979-makerbeam-launch-pad
https://narhams.org/library/tech/021-LaunchRails.pdf