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DIFF Subgroup
H01P 1/211

Waffle-iron filters; Corrugated structures

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Auxiliary devices > Frequency-selective devices, e.g. filters > Hollow waveguide filters > Waffle-iron filters; Corrugated structures

CPC:

Auxiliary devices (coupling devices of the waveguide type H01P5/00) > Frequency-selective devices, e.g. filters > Hollow waveguide filters (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence) > Waffle-iron filters; Corrugated structures

No child classifications to compare. This is a leaf node in both IPC and CPC.