Related by context. Frequent words. (Click for all words.) 49 morse code 47 wirelessly transmitted 45 coded 44 teletype 44 telegraphic 44 Enigma machine 44 shortwave radio 43 cassette recorder 43 garbled 43 decoded 42 coded messages 42 Ricardo Makyn Staff Photographer 42 vacuum tubes 41 musical notation 41 encoded 41 Adm. Chester Nimitz 41 EEGs 40 hydrophone 40 floppy disc 40 telegrams 40 videocassette 40 digitized 40 transmitted electronically 40 phonographs 40 transmit 40 protruding wires 40 telegraphy 40 manual typewriters 40 intelligibly 40 typewriter 40 telephones 40 decoding 40 disembodied voices 40 decode 39 wristwatches 39 automata 39 cassette tapes 39 handwritten 39 antiaircraft guns 39 spyglass 39 Upload trail 39 radios 39 typewriters 39 matchbox sized 39 cosmonauts Fyodor Yurchikhin 39 newsreel 39 computer 38 magic lantern 38 handheld radios 38 typewritten 38 handwritten manuscript 38 warning systems ELINT 38 mine sweepers 38 sensors actuators 38 Casio keyboard 38 CD Roms 38 transmitted 38 decrypting 38 Spy satellites 38 ham radios 38 walkie talkies 37 carrier pigeons 37 typed 37 radar altimeter 37 electrocardiograms 37 Samuel FB 37 waveform 37 computers 37 pneumatic tube 37 cassette tape 37 specially formatted 37 transmitting 37 Mars Odyssey orbiter 37 Singer sewing machine 37 telegraph 37 photocopied 37 military attache 37 floppy disk 37 Visit BBC Webwise 37 recorders 37 DVB ASI 37 gramophones 37 telegraph operator 37 mobile telephones 37 transmitter 37 voice recorder 37 abbreviations acronyms 36 Palm Pilots 36 retransmitted 36 vacuum tube 36 Hi Mom 36 waveforms 36 switchboard operators 36 handheld PDA 36 pinyin 36 Digitized 36 crackly 36 videocassette recorder 36 beepers 36 cassette deck 36 telex