| 1923 PLEASANT Safety Rail For Railroads Patent |
| 1939 FIELD Light Signal For Railroads Patent |
| 1947 JUDGE Light Signal For Railroads Patent |
| 1922 JOE Door Opener For Railroads Patent Print |
| 1927 DAVIS Switch For Mine Railroads Patent |
| 1951 BOVARD Warning Signal For Railroads Patent |
| 1941 MARIO Trackage For Toy Railroads Patent |
| 1937 WIGHT Switch Machine For Railroads Patent |
| 1931 HOWE Switch Machine For Railroads Patent |
| 1926 FRED Semaphore For Toy Railroads Patent |
| 1934 BROWN Car Retarder For Railroads Patent |
| 1935 MERKEL Light Signal For Railroads Patent |
| 1929 HAND Automatic Gate For Railroads Patent |
| 1925 JOSEPH Bridge Signal For Railroads Patent |
| 1949 MOORE Light Signal For Railroads Patent |
| 1938 MOCK Track Circuit For Railroads Patent |
| 1931 DUFFY Signaling System For Railroads Patent |
| 1932 BROWN Car Retarder For Railroads Patent |
| 1930 HOWE Switch Machine For Railroads Patent |
| 1927 WORSTER Signal System For Railroads Patent |
| 1939 LINDSEY Signal Device For Railroads Patent |
| 1943 HEWES Track Switch For Railroads Patent |
| 1932 FRANK Signaling System For Railroads Patent |
| 1931 WIGHT Signaling System For Railroads Patent |
| 1935 BROWN Car Retarder For Railroads Patent |
| 1932 DICKE Signaling System For Railroads Patent |
| 1961 MAYNARD Switch Machine For Railroads Patent |
| 1931 DICKE Signaling System For Railroads Patent |
| 1937 THEODORE Track Circuit For Railroads Patent |