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referentievlak v
el.	reference plane; reference surface
mater.sc.	reference section
meas.inst.	datum level
mech.eng.	datum plane; tool reference plane
transp., construct.	datum
transp., mater.sc.	reference positioning plane

referentievlak: 4 phrases in 3 subjects

Life sciences	1
Mechanic engineering	2
Transport	1