Are any of Claud Butler's frame makers still alive? They would be in a first hand position to describe exactly what the Claud Butler Bi-Laminate process was. Sometimes advertizing slogans are not accurate descriptions of what the product actually is. C.J. Scheiner Brooklyn, NY, USA
PS: Within the USA, the expression :"Southerner" and "Northerner" and "Westerner" and "Easterner" are not pejorative, just geographically descriptive.