foundation trench (foundation pit)

back-filling

E 02 D 17/12

bulkhead; concrete in situ

foundry

B 22 D 47/00

foundry crane

overhead travelling crane

B 66 C 17/10

foundry ladle

foundry crane for transporting ladles

B 66 C 17/10

foundry slag

separating plant

B 03 B 9/04

drop shaft (open caisson); foundation engineering

fountains for spraying liquids

B 05 B 17/08

pillar fountain (drinking fountain)

E 03 B 9/20

spraying; fountain for spraying liquid

wash-fountain; domestic plumbing installation

fountain lighting

F 21 P 7/00

fountain pen

B 43 K 5/00

filling device

B 43 K 11/00

piston fountain-pen

B 43 K 5/06

fountain-pen cap

B 43 K 23/12

four-cylinder rotary offset press

B 41 F 7/12

four-cylinder spinning

D 01 G

D 01 H 5/22

four-duct air conditioning plant

F 24 F 3/08

four-high rolling stand

B 21 B 13/14

four-high stand

B 21 B 13/14

four-layer diode

switching diode; semiconductor device manufacture from A₄ elements / A₃-B₃ compounds

H 01 L 21/18

four-layer triode

H 01 L 29/74

1 nitrogen atom

C 07 D 205/00

1 nitrogen atom; 1 oxygen atom

four-pole network, electric

measuring; of electric parameters

four-position cooker switch

H 01 H 19/50

combustion engine, convertible from two-stroke cycle to four-stroke cycle

F 02 B 69/06

two-stroke cycle; combustion engine, convertible from two-stroke cycle to four-stroke cycle

four-stroke engine

crankcase pump

F 02 B 33/26

four-way fork-lift truck

mast

B 66 F 9/10

four-way socket

H 01 R 25/00

four-wheel stacker

B 66 F 9/06

Fourcault process

sheet glass

C 03 B 15/06

head box; paper-making machine

length, continuous; making continuous lengths of paper etc. on Fourdrinier machine

paper, multi-layer; making multi-layer paper on Fourdrinier machines

paper-making machine; for continuous webs

shaking-apparatus; paper-making machine

wire-cloth; tilting / raising / lowering mechanism