Calculagraph
The Calculagraph is a device which mechanically calculates and prints the elapsed time between two events. Their best known, earliest use was as a means of tracking of table usage in pool halls. Later, until the advent of the digital era, they became the standard way to clock the duration of toll telephone calls.
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Calculagraph
The Calculagraph is a device which mechanically calculates and prints the elapsed time between two events. Their best known, earliest use was as a means of tracking of table usage in pool halls. Later, until the advent of the digital era, they became the standard way to clock the duration of toll telephone calls.
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De calculagraaf was een klok e ...... bijvoorbeeld de PTT gebruikt.
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The Calculagraph is a device w ...... ation of toll telephone calls.
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De calculagraaf was een klok e ...... bijvoorbeeld de PTT gebruikt.
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The Calculagraph is a device w ...... ation of toll telephone calls.
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Calculagraaf
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Calculagraph
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