Aanvulling NVHR online bibliotheek (Algemeen)

door John Koster ⌂ @, Utrecht, 07.10.2018, 17:40 (224 dagen geleden) @ John Koster

Nieuw:

Marconi- Marconi receiving valves, 1938
How to make the most popular all wave 1 and 2 tube receivers, 1938
Gernsback, Hugo - All about aerials; design, installation, doublets, double doublets, inverted "L"s, transmission lines, 1938


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