| 51NATURALDARKRUBY | 24446 | GENERAL ELECTRIC COMPANY |
| 51NDR | 08108 | LAMP INDUSTRY FOR USE WITH INDUSTRY DESIGNATIONS AND ABBREVIATIONS FOR LAMPS |
| 51R | 08108 | LAMP INDUSTRY FOR USE WITH INDUSTRY DESIGNATIONS AND ABBREVIATIONS FOR LAMPS |
| 51RED | 08108 | LAMP INDUSTRY FOR USE WITH INDUSTRY DESIGNATIONS AND ABBREVIATIONS FOR LAMPS |
| 51R | 08806 | GENERAL ELECTRIC CO MINIATURE LAMP PRODUCTS DEPT LIGHTING BUSINESS GROUP |
| MS15573-2 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |