https://www.epo.org/de/boards-of-appeal/decisions/t161264eu1
T 1264/16 (Notch filter/STMICROELECTRONICS) vom 22.01.2020
notch filterstmicroelectronicsvom
https://www.elliotscientific.com/Iridian-476-NNF-R
476-10 NNF Iridian Narrow Notch Filter for Raman
Iridian Spectral Technologies Ltd designs and manufactures a range of narrow notch filters for Raman and other spectroscopy techniques 1203.
notch filteriridiannarrowraman
https://www.eatmybeats.com/shop/c/p/LR-Baggs-Align-Equalizer-Acoustic-Preamp-Pedal-with-6-Band-EQ-and-Notch-Filter-x43003934.htm
LR Baggs Align Equalizer Acoustic Preamp Pedal with 6 Band EQ and Notch Filter - 897042002235
Align Series Equalizer