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Patent, Filed 19 Jul 68, patented 3 Jul 90,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
An electronic barrier utilizes a bifurcated beam of wave energy to establish a barrier area having a null between the forks thereof. Objects encroaching on said beam cause a portion thereof to be scattered in the forward direction. Suitable receiver equipment located remote from the source of the bifurcated beam and responsive to the forward scattered beam is connected to provide an indication of said encroachment. Patents. rrh
APPROVED FOR PUBLIC RELEASE