DIFF Subgroup
H04B 7/18521 Full Title
Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) > Relay systems > Active relay systems > Space-based or airborne stations; (H04B7/204 takes precedence)
H04B 7/18521 Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) > Relay systems > Active relay systems > Space-based or airborne stations; (H04B7/204 takes precedence)