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Reis telephone receiver, 1863

Reis telephone receiver, 1863

1863
Reis telephone transmitter, 1863

Reis telephone transmitter, 1863

1863
Reis telephone, 1863.

Reis telephone, 1863.

1863
Glass dome cover for Reis telephone receiver, J W Albert, Frankfurt, 1863

Glass dome cover for Reis telephone, 1863

1863
Framed letter from Philip Reis, dated 13.7.1863, reworking Reis telephone

Framed letter from Philip Reis, dated 13.7.1863, re working Reis telephone, with glazed frame

1863