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Sonotone Model 977

Stainless steel one-piece 3 vacuum tube body aid, with green insert running vertically down the front, gold clip with 'S', two square microphone openings hidden by gold clip in middle upper front, 4 grooved lines running vertically aside the green insert volume control knob on top in green, on/off switch on top, and battery door swings out from side.

RadioEar Model PM Permo Magnetic Multipower, 1946

Ivory plastic two-piece body aid with 3 vacuum tubes, vertical microphone grills on front facing sideways, one dial on both sides, one dial on top, one cord for battery pack, one cord for ear receiver, and one silver clip on back. First wearable vacuum tube hearing aid with telephone coil. First VT hearing aid to use magnetic microphone.

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