George Boos Company, Munich, Germany

My parish is preparing to celebrate the 100th anniversary of the dedication of our current church building. The anniversary committee on which I serve would like to publish a pamphlet. Toward that end, we are seeking information about the manufacturer of the church's stained glass windows -- the George Boos Company, of Munich. There appears to be an abundance of information available about Mayer and Company and a couple other Munich manufacturers, but we've been stymied in our search for materials about the George Boos Company. (I should mention I have found a reference to the Boos Company in a piece written by Albert Tannler, of the Pittsburgh History and Landmarks Fundation. I also found a Boos reference in Jean Farnsworth's book about Philadelphia Stained Glass. But that's it.) We would be truly grateful for any guidance. Thank you!