Westinghouse Air brake Catalogs part 4
No. 4 Pneumatic Brake Pipe Vent Valve
Part Catalog No. 3211=2 March, 1924 (Superseding Issue of March, 1922)
Air=Signal Apparatus
Part Catalog 3415=1 September, 1925 (Superseding Issue of July, 1922)
Centrifugal Dirt Collectors, Strainers, Check Valves, Branch Pipe Tees, Filler Blocks, Drain Cups
Part Catalog No. 3216=2 March, 1924 (Superseding Issue of March, 1922)
Friction Draft Gear
Part Catalog 3218=1 June, 1924 (Superseding Issue of May, 1921 and Supplements 1 and 2)
Steam Valves
Part Catalog No. 3216=8 January, 1923 (Superseding Issue of September, 1920)
Cocks
Part Catalog No. 3216=4 June 1925 (Superseding Issue of July, 1921)