without fixed connection between spacing member and envelope

Full Title

Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps (details of electron-optical or ion-optical arrangements H01J3/00) > Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies > Spacing members extending to the envelope > without fixed connection between spacing member and envelope