220 / | HD | RECEPTACLES |
FOR 127 | DF | MULTILAYER BARRIER STRUCTURE (220/415) {23} |
FOR 132 | DF | .~ Evacuated space between layers (220/420) {3} |
FOR 133 | DF | .~.~ With intermediate insulating means (220/421) {2} |
FOR 135 | .~.~.~ Plus distinct reflector means (220/423) |