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- Abbe;0;
- Accumulators;90;
- Achard;200;
- Acid rain;303;
- Acoustic;506;
- Acoustics;657;
- Adapter;820;
- Aepinus;967;
- Agricola;1040;
- Aiken;1144;
- Alban;1199;
- Albert J;1255;
- Albert W;1317;
- Alembert;1409;
- Alexanderson;1499;
- Alford;1579;
- Alhazen;1627;
- Alvarez;1718;
- Amici;1773;
- Amontons;1830;
- AmpΦre;1885;
- Amsler-Laffon;1966;
- Analog to digital converter;2060;
- Anaxogoras;2229;
- Anderson;2286;
- ┼ngstr÷m;2342;
- Animation;2426;
- Anschⁿtz;2514;
- Anthemios;2579;
- Antimatter;2648;
- Antonov;2726;
- Aperture;2886;
- Aperture;2797;
- Apollo Missions;3003;
- Appleton;3128;
- Arago;3191;
- Archimedes;3269;
- Archytas;3336;
- Arco;3397;
- Ardenne;3464;
- Argand;3525;
- Aristarchus;3570;
- Arithmetics;3652;
- Arkwright;3805;
- Armstrong;3889;
- Arnold;3959;
- ARPANET;4020;
- Arrhenius;4226;
- Arsonval;4292;
- ASCII;4355;
- Aspdin;4523;
- Aston;4589;
- Astronomical;4644;
- Astronomy;4793;
- Atmosphere;4968;
- Atom;5037;
- Atomic nucleus;5116;
- Attractive force;5212;
- Atwood;5319;
- Auer;5366;
- August;5419;
- Avicenna;5476;
- Avogadro;5561;
- Axis;5641;
- Babbage;5739;
- Bardeen;5888;
- Basov;6052;
- Bell;6153;
- Benz;6239;
- Berliner;6313;
- Betamax;6407;
- Binary Code;6552;
- Boole;6813;
- Booster rockets;6885;
- Bow wave rudders;6974;
- Brattain;7101;
- Bulkheads;7247;
- Bus;7504;
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