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left-handed thread
mater.sc., industr., construct.	linkse schroefdraad
left hand thread
mater.sc., mech.eng.	linkse schroefdraad; linkse draad
transp., mater.sc.	linkse schroef; rechtse schroef
left-hand thread
mater.sc., mech.eng.	linkse schroefdraad; linkse draad

left-handed thread : 4 phrases in 2 subjects

Materials science	2
Mechanic engineering	2