Filter for attachment to an in-ear hearing aid to prevent the mi

Details Filter for attachment to an in-ear hearing aid to prevent the mi Filter for attachment to an in-ear hearing aid to prevent the mi

1992-12-28

1995-02-21

Burke, Wallace R.

Environmental heating and cooling; fluid handling and sanitary e

Fluid handling or treatment equipment

Treatment

D24174

Patent

active

D03557022

REFERENCES:
patent: D267429 (1982-12-01), Marada
patent: 4553627 (1985-11-01), Gastmeier et al.
patent: 4945569 (1990-07-01), Kulman
patent: 4972488 (1990-11-01), Weiss et al.
patent: 5166659 (1992-11-01), Navarro

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