39930 - Signs & Advertising displays (Miscellaneous)
39931 - Electric signs
3993112 - - Luminous tubing (Neon, Argon, Hydrogen, etc.)
3993113 - - Fluorescent lamp
3993114 - - Incandescent bulb signs: Electronic variable message displays
3993115 - - Incandescent bulb signs: Other
3993116 - - Electric signs (General + combinations of Luminous fluorescent & Incandescent)
3993199 - - Electric signs (Miscellaneous)
39932 - Nonelectric signs
3993212 - - Metal signs: Screen printed
3993222 - - Metal signs: Other
3993232 - - Wood signs: Screen printed
3993242 - - Wood signs: Other
3993252 - - Signs: Counters, Floor displays, POS: Letterpress
3993262 - - Signs: Counters, Floor displays, POS: Screen printed
3993272 - - Signs: Counters, Floor displays, POS: Offset (Lithographic)
3993276 - - Signs: Counters, Floor displays, POS: Unprinted
3993278 - - Signs: all other: Screen printed
3993288 - - Signs: all other: Other
3993299 - - Nonelectric signs (Miscellaneous)
39933 - Advertising specialties
3993XX0 - - Signs & Advertising displays (Miscellaneous - Volume)
3993XX2 - - Signs & Advertising displays (Miscellaneous - Speciality)