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Arcs
Raamat
Centrifuge Rotor
Resistors
Photomultiplier
Providence 1990
Maszyna Trurla
Standard Unit
Chitty Chatty
Hydrogen Thyratron
Tango
Jim Crow
GL-869B
SMS
Conqueror Worm
Cherry Wainer
WWII Radar
Signature
Tank Girl
Air Raid Drill

Error Correcting

TABLE OF FREQUENT INTERNATIONAL MORSE CODE GARBLES

Manual error correcting, circa 1943. From a US Navy publication.