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coiled-coil filament
helical filament wound from single-coil filament
Note 1 to entry: The term "double-coil filament" can also be used sometimes for filament structure classification.
Note 2 to entry: This entry was numbered 845-08-05 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-186 in CIE S 017:2011.