| 1930 BLOSSER Railway Traffic Controlling Art |
| 1930 UNION Thread Controlling Mechanism Sewing Machines |
| 1930 WIGGER Driving Controlling Fin Shaped Propellers |
| 1930 HANDLEY PAGE LTD Means Controlling Aeroplanes |
| 1930 UNION Railway Traffic Controlling Art |
| 1930 CRAIN Controlling Ships' Steering Gears Art |
| 1930 BUCK Railway Brake Controlling Art Print |
| 1930 GEN ELECTRIC Controlling Electric Sewing Machines |
| 1930 JOSEPH Aircraft Supporting Controlling Surface |
| 1930 HARDESTY Controlling Mechanism Patent Print |
| 1930 COBOURN Controlling Railway Switches Art |
| 1930 SINGER Needle Thread Controlling Sewing Machines |
| 1930 WOOD Railway Switch Controlling Art Print |
| 1930 THOMPSON Railway Traffic Controlling Art |
| 1930 BOSSART Railway Traffic Controlling Art |
| 1930 ALEXANDER Railway Traffic Controlling Art |
| 1930 COLEMAN Railway Traffic Controlling Art |
| 1930 UNION Controlling Railway Switches Art |
| 1930 STEPHENSON Controlling Electric Sewing Machines |
| 1930 SINGER Sewing Machine Needle Controlling Mechanism |
| 1930 UNION SWITCH SIGNAL CO Railway Switch Controlling |
| 1930 MCCANN Railway Traffic Controlling Art |
| 1930 BAUGHMAN Railway Traffic Controlling Art |
| 1930 VANHORN Railway Traffic Controlling Art |
| 1930 WALLACE Railway Traffic Controlling Art |
| 1930 NELSON Needle Thread Controlling Sewing Machines |
| 1930 GEIGER Railway Traffic Controlling Art |
| 1930 CARD Sewing Machine Needle Controlling Mechanism |
| 1930 WAYNE Controlling Means Airplanes Art Print |
| 1930 MARCEL Controlling Aeroplanes Similar Aircraft |
| 1930 AX Controlling Mechanism Aeroplanes Art |
| 1930 HANDLEY Means Controlling Aeroplanes Art |
| 1930 UNION SWITCH SIGNAL CO Railway Brake Controlling |
| 1930 NETTLETON Railway Traffic Controlling Art |