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Multimodal indicator safety device for ladder positioning

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Description patent published in 2012
Author/s

author: Peter I. Simeonov  Hongwei Hsiao  John R. Powers 

Publication date May 1, 2012
Language English
Country of origin
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http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=8167087&OS=8167087&RS=8167087
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