A
* Vitaly Mikhaylovich Abalakov, (1906-1986), Russia — camming devices, Abalakov thread (or V-thread) gearless ice climbing anchor.


* Robert Adler, (1913-2007), Austria/United States — wireless remote control
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* Akbar the Great, (1542-1605), Mughal India — prefabricated home, movable structure

* Turhan Alçelik (c. 2006), Turkey — non-glaring headlamp
* Rostislav Alexeyev, (1916-1980) , Russia – Ekranoplan.


* Mary Anderson, (1866–1953), United States — windshield wiper blade

* Archimedes, (c. 287-212 BC), Greece — Archimedes' screw


* Ami Argand, (1750-1803), France — Argand lamp

* Edwin H. Armstrong,(1890-1954), USA — FM radio
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* William George Armstrong, (1810-1900), UK — hydraulic crane

* Neil Arnott, (1788-1874), UK — waterbed


* Al-Ashraf, (fl. 1282-1296), Yemen — dry compass

* Joseph Aspdin, (1788-1855), England — Portland cement


* John Vincent Atanasoff, (1903-1995), United States — modern programmable computer

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