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kijkglas n
agric.	sight flow glass
agric., chem.	inspection glass; plexiglass tube
astronaut., transp.	sight gauge
earth.sc., mech.eng.	sight glass
industr., construct., mech.eng.	bye hole; observation hole; peep hole; peephole; sight hole
met.	peep-hole; viewing device
transp., chem.	sight-glass
transp., mech.eng.	eye piece