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normally open

abbr. no.; nopn
abbr., mil., WMD n.o. (contact)
Normally Open
abbr., electr.eng. 1A-1 (Interex)
abbr., scottish N/O
normally-open
: 10 phrases in 7 subjects
Automated equipment4
Computers1
Earth sciences1
Electric traction1
General1
Mechanic engineering1
Transport1

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