Denver Post Archives

JUL 17 1969, JUL 20 1969 This Device Is Like The City's First Dial System Called a step-by-step machine, this unit is a demonstrator of how calls are handled. The upper left cylinder connects your line to the system, the second provides the dial tone, the third moves switches the number of pulses indicated by the digit dialed and the last three move the number of pulses indicated and the lower left cylinder handles the last two digits of the number dialed and provides the ringing tone for the number you dialed. Credit: Denver Post (Denver Post via Getty Images)
JUL 17 1969, JUL 20 1969 This Device Is Like The City's First Dial System Called a step-by-step machine, this unit is a demonstrator of how calls are handled. The upper left cylinder connects your line to the system, the second provides the dial tone, the third moves switches the number of pulses indicated by the digit dialed and the last three move the number of pulses indicated and the lower left cylinder handles the last two digits of the number dialed and provides the ringing tone for the number you dialed. Credit: Denver Post (Denver Post via Getty Images)
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Crédito:
Denver Post / Colaborador
Editorial n.º:
837049202
Colección:
Denver Post
Fecha de creación:
17 de julio de 1969
Fecha de subida:
Tipo de licencia:
Inf. de autorización:
No se cuenta con autorizaciones. Más información
Fuente:
Denver Post
Nombre del objeto:
dpl_1623222.jpg
Tamaño máx. archivo:
2434 x 3000 px (20,61 x 25,40 cm) - 300 dpi - 2 MB