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Vacuum Tube Hearing Aids: 1921-1953

	Sonotone Model 531 Vacuum Tube Hearing Aid (1942) (H143, B322)

	Sonotone Model 533 Vacuum Tube Hearing Aid (1942) (B252)

	Sonotone Model 600 Vacuum Tube Hearing Aid (1945) (H144, B52)

	Sonotone Model 700 Vacuum Tube Hearing Aid (1946) (B276)

	Sonotone Model 900 Vacuum Tube Hearing Aid (1947) (H216, H217, H218, B773)

	Sonotone Model 910 Vacuum Tube Hearing Aid (1949) (H219, B54)

	Sonotone Model 920 Vacuum Tube Hearing Aid (1949) (B1064-220)

	Sonotone Model 925 Vacuum Tube Hearing Aid (1950) (B1065-222)

	Sonotone Model 940 Vacuum Tube Hearing Aid (1950) (H221, B593)

	Sonotone Model 966 Vacuum Tube Hearing Aid (1950) (B452)

	Sonotone Model 977 Vacuum Tube Hearing Aid (1951) (B411)

	Sonotone Model 988 Vacuum Tube Hearing Aid (1952) (B1063-223)

Click on the "General Information" button (top button left) for an overview and general information on this category of hearing aid.

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