E. F. Johnson Company Employee. Charlotte Olson Lau Anderegg. Material: plastic, paper. Size: 2" x 2" photo transparency mounted in cardboard frame. Description: color photo of an E.F. Johnson Company employee, Char Olson Lau Anderegg, working on the multiple secondary operation machine (mills, drills, taps) at the E.F. Johnson Company. Char Olson, Char Lau, Char Anderegg, Charlotte Olson, Charlotte Lau, Charlotte Anderegg.