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The American Telegraphone Company, which had attempted unsuccessfully to market the machine, claimed that AT&T feared the device’s ability to record calls.”

The telegraphone was the world’s first answering machine.

A 1925 Edison Western Union Stock Ticker, a 1915 Springfield-made Telegraphone and an 1895 Edison Home Phonograph are among the items planned for the display.

The 'telegraphone' directly records on a steel tape the sounds of the human voice as sent through the telephone, and by an absolutely invisible re-arrangement of the magnetized particles of steel, makes a writing in which there is no possibility of visual legibility.

"A telegraphone," replied Constance, shutting it off for a moment.