Monopack hearing aid, OL 56, with tone control, no ear mould, c. 1960 (with battery)
- Object Number:
overall (ear piece): 21 mm x 22 mm x 32 mm,
overall (case): 23 mm x 63 mm x 70 mm,
overall (previous): 73 mm x 60 mm x 22 mm,
- Royal National Throat, Nose & Ear Hospital
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