DIFF Subgroup
H04R 11/06 Telephone receivers
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Transducers of moving-armature or moving-core type > Telephone receivers
CPC:
Transducers of moving-armature or moving-core type (acoustic diaphragm of magnetisable material directly coacting with electromagnet H04R13/00) > Telephone receivers
No child classifications to compare. This is a leaf node in both IPC and CPC.