Assignee

LDJ IND INC

US·1 granted patent·62 citations·filing 1990–1990

Technology mixA61H1 G01S1 H04M1

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1 record

0165US5144294ARadio frequency message apparatus for aiding ambulatory travel of visually impaired personsLDJ IND INC·Filed 1990·Granted Sep 1, 1992·62 cites·15 claims

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