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Manual central battery system telephone exchange model 7200 with visual call signal.
Automatic central battery operated telephone set, with internal buzzer. Wall model made of black bakelite.
Manual, local battery and magneto telephone switchboard. Equipped with 5 outside lines, 25 inside lines (5 long line circuits and 25 short line circuits) and 5 cord circuits. Model made of wood, consisting of a wooden box with a wooden system....
Explosion-proof device with central battery and exterior chime, designed to withstand harsh weather conditions and for industrial use with a risk of explosion
NATIONAL LABOUR REGULATIONS IN THE NATIONAL TELEPHONE COMPANY OF SPAIN
Poster announcing the 6 figures in Madrid.
Zaragoza as seen from the roof of the telephone exchange.
La Cibeles Fountain.
Puerta de Toledo. Madrid.
Inauguration parchment of the automatic in Jaén.
METHOD OF RECORDING WORK CARRIED OUT BY LINE CONSTRUCTION AND CABLE LAYING PERSONNEL