| 1927 HOWARD Railway Traffic Controlling Art |
| 1927 UNION Controlling Highway Crossing Signals |
| 1927 PAUL Electrical Controlling Means Organs |
| 1927 BOSSART Railway Traffic Controlling Art |
| 1927 GALLAGHER Car Brake Controlling Device Art |
| 1927 BEALL Railway Traffic Controlling Art |
| 1927 JOSEPH Controlling Marine Engines Art Print |
| 1927 SYDNEY Traffic Controlling Railways Art |
| 1927 TOWNSEND Door Controlling Device For Traps |
| 1927 AUSTIN ORGAN Swell Shutter Controlling Mechanism |
| 1927 THOMPSON Railway Traffic Controlling Art |
| 1927 HARALSON Controlling Motor Vehicles Art |
| 1927 NETTLETON Railway Traffic Controlling Art |
| 1927 MCCANN Railway Traffic Controlling Art |
| 1927 CLYDE Guiding Controlling Mechanism Trucks Like |
| 1927 HALVOR Railway Traffic Controlling Art |
| 1927 BAUGHMAN Railway Traffic Controlling Art |
| 1927 YOUNG Controlling Highway Crossing Signals |
| 1927 RAILWAY SIGNAL LTD Traffic Controlling Railways |
| 1927 NELLIE Car Brake Controlling Art Print |
| 1927 HANDLEY Means Laterally Controlling Aircraft |
| 1927 WALLACE Railway Traffic Controlling Art |
| 1927 ANDERSON Controlling Switch Spotlights Like |
| 1927 SMITH SEYMOUR Controlling Switch Patent |
| 1927 GILSON Railway Traffic Controlling Art |
| 1927 UNION Railway Traffic Controlling Art |
| 1927 LUCAS Railway Traffic Controlling Art |
| 1927 AUSTIN Swell Shutter Controlling Mechanism |
| 1927 LEE Railway Traffic Controlling Art Print |