Patent classifications
H
ELECTRICITY
Load children
H04
ELECTRIC COMMUNICATION TECHNIQUE
Load children
H04B
TRANSMISSION
Load children
13/00
Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
Load children Filter patents View analytics View as hierarchy
H04B13/02
Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
Filter patents View analytics View as hierarchy