Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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B01D
SEPARATION
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46/00
Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
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B01D46/56
with multiple filtering elements, characterised by their mutual disposition
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B01D46/64
arranged concentrically or coaxially
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