... 1004 anti-tank 994rifles 403, 405, 983–4 anti-tank 994 Browningautomatic 992 repeating 985ring frames 841–2Rio Tinto mines 55, 70, 231rivets 14 age-hardening 122 road maps 461road transport ... 870pulley 18Pullman cars 577–9pulse-code modulation 749pumped-storage scheme 833pumps horse-powered 269 steam-powered 33,275, 285, 952, 954 water-powered 235wind-powered 258punched-card systems ... 60, 62, 69uranium, nuclear fission 214uranium glazes 194Uranus probe 661 V-1 flying bomb 1005V-2 rocket bomb 649–51, 661, 1005V-mail (microfilm) 734vacuum 32–3, 273vacuum cleaners 925–7valves...