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needle valve 607
NEG pump, see ‘non-evaporable getters’
Nennweite (NW), see ‘KF coupling’
neon 311,668,669,670,671
neopentyl polyol esters, see ‘synthetic lubricants’
neoprene 580,645,685
neutron 6
nickel 686
-, nickel-plating 615
-, permeability for hydrogen 609,625
Nier source 454
niobium 319,637
nitric acid 84
nitrogen 197,493,668,669,670,671
Noble diode pump, see ‘differential ion pump’
noble gases, cleaning method 320
nominal pumping speed 165
non-evaporable getters 319
non-ferro alloys
-, beryllium-copper 637,683
-, brass 637
Northey (A.J.) 260
Nottingham (W.B.) 432
nylon, see ‘polyamide’