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/ 27
2 wave siren disks

2 wave siren disks

Rudolph Koenig
circa 1875
accessories for AT&T Telehelper 1600 automatic dialer

accessories for AT&T Telehelper 1600 automatic dialer

American Telephone and Telegraph Company
1984
ACME Reflex Acmefone radio receiver

ACME Reflex Acmefone radio receiver

ACME Apparatus Company
1923
acoustic glass tube, b flat

acoustic glass tube, b flat

Rudolph Koenig
late 19th Century
acoustic glass tube, c flat

acoustic glass tube, c flat

Rudolph Koenig
late 19th Century
acoustic glass tube, c flat

acoustic glass tube, c flat

Rudolph Koenig
late 19th Century
acoustic glass tube, c sharp

acoustic glass tube, c sharp

Rudolph Koenig
late 19th Century
acoustic glass tube, d flat

acoustic glass tube, d flat

Rudolph Koenig
late 19th Century
acoustic glass tube, e flat

acoustic glass tube, e flat

Rudolph Koenig
late 19th Century
acoustic glass tube, e flat

acoustic glass tube, e flat

Rudolph Koenig
late 19th Century
acoustic glass tube, g flat

acoustic glass tube, g flat

Rudolph Koenig
late 19th Century
acoustic glass tube, pitch unknown

acoustic glass tube, pitch unknown

Rudolph Koenig
late 19th Century
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