Siemens presented the Siretta 339, the first in-the-ear hearing instrument
In 1966, Siemens, now Sivantos, presented the Siretta 339, the first in-the-ear hearing instrument. The history of electrical…
Year: 1966
In 1966, Siemens, now Sivantos, presented the Siretta 339, the first in-the-ear hearing instrument. The history of electrical…