Scope and Contents Traylor Engineering and Manufacturing Company, details and assembly designs crusher (1936, 1939, 1940) Ty-Rock Screen, installation plans (1940-1951) United Filters Corp., special acid proof wood slat leaf for filter (1923) Vredenburg Development Company, outline model FVS 124 (1949) Vulcan Iron Works, assembly drawings for No. 80 hoist (1945,...