• Started In 1965  in Germany by Jzchak 'EZ' Wajcman and Bill Lawrence(Willi Lorenz Stich).  There is some info here http://www.billlawrenceusa.com/swampkaster/history.htm though, it seems to me to make suspiciously little mention of Bill(Mr.Stich) aside from the disclaimer at the bottom of that page
• Lawrence Electro-sound Closed in 1970 (? After Bill left for New York ? Poor sales ?)

The L-90XL and L-100, both produced in the late seventies by Lawrence Sound Research and marketed/advertised/branded as "Bill Lawrence Products" (see lower right of ad):  originally Lawrence Electro-sound offerings?

Note the caption under the second pickup "L-100  Reissue of the 1965 Bill Lawrence two sound pickup-- the first hot replacement pickup ever made"

 Advertisement/photos as they appeared in Guitar Player magazine, July 1979.

Photo of Aerosmiths Joe Perry and Brad Whitford credited to Ron Pownall Boston

See the Timeline page for more details.