| 439 / | HD | ELECTRICAL CONNECTORS | 
| 527 | DF | WITH SUPPORTING MEANS FOR COUPLING PART {18} | 
| 540.1 |  | .~ Supporting plural, independent coupling parts {2} | 
| 541 | DF | .~.~> Plural lamp or electron tube sockets | 
| 541.5 | DF | .~.~> Stacked right-angle connector for use on printed circuit board (i.e., PCB) |