Improvements introduced in the rectilinea reading tocadisc. (Machine-translation by Google Translate, not legally binding)
ES433340A1
Improvements introduced in the automatic tocadiscos. (Machine-translation by Google Translate, not legally binding)
ES433339A1
Improvements in the tocadiscos speed change mechanisms. (Machine-translation by Google Translate, not legally binding)
ES414545A2
Improvements in recording devices-magneto phonic reproducers. (Machine-translation by Google Translate, not legally binding)
ES414544A1
Improvements in the automatic stop of tape in the magneto phonic recorders-players. (Machine-translation by Google Translate, not legally binding)
ES399096A1
Improvements in the magneto phonic recording devices. (Machine-translation by Google Translate, not legally binding)
ES378320A1
Improvements in the automatic stop tape finish system in the magneto phonic recorders. (Machine-translation by Google Translate, not legally binding)
ES332064A3
Improvements in the electric watches. (Machine-translation by Google Translate, not legally binding)
ES331821A3
Improvements in the electromotors for continuous current of low tension and reduced speed. (Machine-translation by Google Translate, not legally binding)
ES330833A3
Improvements in the magneto phonic reproductive apparatus. (Machine-translation by Google Translate, not legally binding)
ES328912A3
Improvements in the manufacture of supports for continuous magnetofonic tapes. (Machine-translation by Google Translate, not legally binding)
ES325771A3
Improvements in the portable phonographic reproducers. (Machine-translation by Google Translate, not legally binding)
