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Conversation tube hearing aid

1870-1920

Vaginal pipe, glass in metal tube

Conversation tube hearing aid

1870-1930

Conversation tube hearing aid

1870-1920
X-ray set for superficial therapy, water-cooled, comprises tube, stand, control panel and power supply, by Victor X-Ray Corporation, English and American, 1930s(?)

X-ray set for superficial therapy

1930-1939