LONDEX, LTD., 207 Anerley Road, London, S.E.20, have introduced a patented system (“Lectralevel”) of floatless liquid level control, designed for automatically pumping out, filling or maintaining the ...
Inventors Yuriy Pchelnikov (left) and David Nyce and one of their SEF sensors. The devices use a sensing element consisting of conducting elements periodic along the direction of propagation of the ...
Results that may be inaccessible to you are currently showing.
Hide inaccessible results