Dahlberg D-5 "Blue Cross" (BC5) Hearing Aid
The Dahlberg D-5 "Blue Cross" (also known as the Model
BC5) transistor
hearing aid was produced by Dahlberg Electronics, Inc. of Minneapolis in
1953. It used three CK718 transistors.
The D-5 "Blue Cross" was enclosed in a chrome case measuring 2½" x 1¾" by
⅞".
It weighed 6½ oz. with its RM-1 mercury battery.
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