CD 1-32 - Insulated supports for battery tanks or trays
CD 33-33 - Unknown Usage
CD 35-39 - Trough for holding non-conductive oil
CD 40-44 - Pin or projection for alignment
CD 45-45 - Item placed in a battery jar
CD 50-55 - Molded male thread to fix to a support
CD 60-64 - Requires a fixed hub for support
CD 100-144 - Single petticoat side groove
CD 145-184 - Double petticoat side groove
CD 185-189 - Pinhole goes all the way through
CD 190-205 - Transposition (Multiple side wire grooves
CD 206-249 - Double petticoat side groove
CD 250-279 - Cable, single or double petticoat
CD 280-289 - Triple petticoat side groove
CD 290-309 - Triple petticoat side groove
CD 310-314 - Sleeves
CD 315-334 - Umbrella type high tension - One pice
CD 335-399 - 2 & 3 part high tension - Cemented
CD 400-499 - Side Groove, single or double petticoat
CD 500-599 - Saddle Groove, single or double petticoat
CD 600-639 - Flared skirt, double or triple petticoat
CD 640-649 - Side groove with support arms, single or double petticoat
CD 650-659 - Cutout or fuse holder style
CD 660-685 - 1 or 2 Arms for Low voltage pairs
CD 686-699 - Unique style for applications involving two or more special features
CD 700 - 700.9 - "Egg" - Pinhole goes all the way through the insulator
CD 701 - 718 - "Egg" - Pintype
CD 721 - 725 - Pintype; Designed to be used with a wood cover
CD 726 - 728.9 - Side wire groove signal - Straight skirt
CD 729 - 732.9 - Side wire groove signal - Concave skirt
CD 734 - 735.9 - Side wire groove "Pilgrim Hat" - One wire ridge
CD 736 - 739.9 - Side wire groove "Pilgrim Hat" - Two wire ridges
CD 740 - 742.9 - Side wire groove "Pilgrim Hat" - Rounded dome
CD 743 - 743.9 - Side wire groove "Beehive"
CD 780 - 780 - "Bureau Knob"
CD 784 - 796 - Cross Top - Slash Top - Teapot - Miscellaneous
CD 1000 - 1020 - Glass Blocks
CD 1021 - 1034 - Lag mounted
CD 1035 - 1044 - Miscellaneous Glass
CD 1045 - 1074 - Shackle and rack spool styles
CD 1075 - 1096 - Glass knobs
CD 1099 - 1110 - Rack spool and break knobs
CD 1113 - 1156 - Spanwire and low voltage strains
CD 1180 - 1200 - Miscellaneous Glass
CD Unlisted - No CD is yet assigned