DOC'S PROTUNE by DOC'S PROPLUGS, INC. (Track this)
Intl: (010) Medical Apparatus US: 044 Filing date: 05-Jun-1990 Serial number: 74066049
DOC'S PROPLUG by DOC'S PROPLUGS, INC. (Track this)
Intl: (010) Medical Apparatus US: 044 Filing date: 04-Jun-1979 Serial number: 73218427
DOC'S by HOSCH, ROBERT G. (Track this)
Intl: (028) Toys and sporting goods US: 022 Filing date: 10-May-1955 Serial number: 71687187