(under the class definition) Devices which are provided with means for preventing the repair of the device.
(1) Note. Some of the devices in this subclass are provided with means to cause the envelope of the device to shatter when an attempt is made to open the envelope for the purpose of repairing or replacing the filament or other electrode. Other of the devices are provided with means to prevent the filament or other electrode from being attached to the lead wires.
SEE OR SEARCH THIS CLASS, SUBCLASS:
236, for devices within the class definition which are provided with a spare or extra electrode which is to be substituted for a defective electrode.
237, for devices within the class definition which have an envelope and parts which are especially designed so that the device may be disassembled to repair an electrode or another part of the device and for devices within the class definition which are provided with means for replacing a defective electrode.
SEE OR SEARCH CLASS
220, Receptacles, 2.1+, for envelopes, per se, for lamps and discharge devices.
