active power filter filter

back filter

entire automatic instead of wash filter

Filter back projection

Filter back projection algorithm

Back Wash

back wash frequency

back wash line

back wash toilet

revoling leaf type filter + vacuum filter

angles back to back

Back filling at abutment back of Bridge or culvert

back reaming and back transportation

back to back

back to back houses

Back-to-Back

(fuzzy)BCK-filter

(The symbol is abbreviated) filter

+ shape and low-pass filter method

11th harmonic filter