Rotary beam invented, but sales stall for lack of suitable mounting structures. First tree appears and is immediately cut down, stripped of branches, placed in a concrete base and called a telephone pole. Beam sales pick up. More beams sold. Installer falls from top of pole.
Safety belt is invented.
The repeater is invented. The name ham operator hangs on, however. Dugout canoe invented. Maritime Mobile Net formed on 14.313 MHz. Nothing much happens for a long time.