beam null line

geodesic null line

Null (-null) additive

null line

null line connection

null line of zero position

null line suppression

null modem

null modem cable

null-null additive

the broken of null line

Electric-power line modem

leased line modem

Power Line Modem

Double line-line voltage control

line-line extreme distance

line-line topological relation in traffic network

on-line line loss

loss-free line (=lossless line =lossless transmission line)