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Dan,

IMHO, that patent is probably expired. Therefore, your work is public
domain, and you can now build and market it to the kit community. You
may yet gain from your efforts. I'd like one! My L-IV-P does not have an
easy mechanical gauge option.

Ted Noel

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.