20 Door holders in the nature of stops, not of metal; door stops, not of metal or of rubber; friction stays in the nature of stops for doors, of non-metallic materials; non-metallic mechanisms, other than electric, for closing doors, namely, shutter closers, not of metal, non-electric; door closing devices, not of metal, non-electric, namely, door closers, non-metallic, other than electric; door opening devices, not of metal, non-electric, namely, door openers, non-metallic, other than electric; locks, other than electric, not of metal; locks, not of metal, for doors; locks and keys, not of metal; padlocks, other than electronic, not of metal; non-metallic mechanisms, namely, spring mechanism, not of metal, other than electric, for opening doors; non-metallic mechanisms, namely, non-metallic, sliding runners, other than electric, for sliding doors; non-metallic mechanisms, namely, non-metallic, sliding runners, other than electric, for raising doors; moldings for cornices, not of metal; rollers for sliding doors, not of metal; window rollers, not of metal; runners, not of metal, for sliding doors; guides for sliding door runners, not of metal, for sliding doors; sliding guides, not of metal, for doors; sliding carriages not of metal for sliding doors; wheels for runners for sliding doors, not of metal; door fittings in the nature of buffers for doors, not of metal; tracks, not of metal, for sliding doors; doors for furniture; sliding doors, not of metal, for furniture; door handles, not of metal; knobs, not of metal; plastic knobs for doors; porcelain knobs for doors; wooden knobs for doors; glass knobs for doors; terracotta knobs for doors; window handles, not of metal; trims, not of metal, for doors; window trims, not of metal; hinges, not of metal, for doors and windows; catches of non-metallic materials for doors; springs for doors, not of metal and not electric; door latches, not of metal; non-metal hinge pivots for doors and windows; non-metallic clamps for fixing doors; screws, not of metal; runners, not of metal, for sliding doors; brackets, not of metal, for furniture; brackets, not of metal, for doors; bolts, not of metal; door bells, not of metal, non-electric; nuts, not of metal; door trims, not of metal; dowels, not of metal; hinges, not of metal; speed retarders in the form of slow close hinges, not of metal