radio engineering rádiotechnika 2 [vynechat] computers 1 [vynechat] dejiny objavov a vynálezov 1 [vynechat] discoverers and inventors 1 [vynechat] history of discoveries and inventions 1 [vynechat] objavitelia a vynálezcovia 1 [vynechat] počítače 1 [vynechat] television 1 [vynechat] televízia 1 [vynechat]