IPC 2013 : E03B 9/16 : Devices for retaining foreign matter, e.g. sand.

IPC2013 > E > E03 > E03B > E03B 9/00 > E03B 9/16[2] > Devices for retaining foreign matter, e.g. sand.
Notes[t] E01 - E06: BUILDING
E SECTION E — FIXED CONSTRUCTIONS.
E03 WATER SUPPLY; SEWERAGE.
E03B INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER (drilling wells, obtaining fluids in general from wells E21B; pipe-line systems in general F17D).
E03B 9/00 Methods or installations for drawing-off water (domestic water-drawing devices E03C; taps or valves per se F16K).
E03B 9/16 · · Devices for retaining foreign matter, e.g. sand.