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There are 14 insulator styles that match your search criteria, shown below:
• Usage type equals Floor Tube

BT 2120
BT 2120
BT 2121
BT 2121
BT 2121.5
BT 2121.5
BT 2122
BT 2122
BT 2123
BT 2123
BT 2124
BT 2124
BT 2125
BT 2125
BT 2126
BT 2126
BT 2127
BT 2127
BT 2128
BT 2128
BT 2129
BT 2129
BT 2130
BT 2130
BT 2131
BT 2131
BT 2132
BT 2132
Of the 14 insulator styles shown above, the following 15 embossings match your search criteria:

Design ID
Primary EmbossingThe Primary Embossing is typically found on the front of the insulator and usually identifies either the manufacturer (such as "Hemingray") or the company that the insulator was made for (such as "AM.TEL.&TEL.CO.")

Insulators with No Name or No Embossing are denoted as such.
EINThe Embossing Index Number (EIN) is a unique number assigned by the collecting hobby to each distinct embossing for an insulator design. It is normally shown in brackets, e.g. [050].
EmbossingMost common terms:
(F-Skirt): Front Skirt
(R-Skirt): Rear Skirt
/: New line of embossing
{}: Special note (not embossed on the insulator)
[#]: Represents a number

Other terms:
{MLOB}: Mold Line Over Base
(F-Crown): Front Crown
(R-Crown): Rear Crown
(F-Umbrella): Front Umbrella
(R-Umbrella): Rear Umbrella
BaseThe base is the bottom of the insulator. Hemingray made 4 different types of bases:

1. SDP: Sharp Drip Points
2. RDP: Round Drip Points
3. CB: Corrugated Base
4. SB: Smooth Base
Year AddedThis is the year that this embossing was officially recognized and added to the McDougald (1991-2008) or Briel (2011-present) insulator price guides. It is not necessarily the year this embossing was discovered.
 Photo
Status✓ = In my collection

If the value in this column says WANTED, then that specific insulator is on my wanted list! If you have that insulator and would like to sell it, click on the WANTED link to submit photos and contact me.
BT 2120NO EMBOSSING [010] [No embossing] {Oct head, screw style} {Hemingray product} SB - No Photo✓
BT 2121NO EMBOSSING [010] [No embossing] {Oct head, screw style} {Hemingray product} SB - No Photo✓
BT 2121.5NO EMBOSSING [010] [No embossing] {Oct head, screw style} {Hemingray product} SB - No PhotoMOST WANTED
($500 Reward)
BT 2122NO EMBOSSING [010] [No embossing] {Hex head, screw style} {Hemingray product} SB - No Photo✓
BT 2122NO EMBOSSING [020] [No embossing] {Hex head with 3 steps, screw style} {Hemingray product} SB - No Photo✓
BT 2123NO EMBOSSING [010] [No embossing] {Hex head, screw style} {Hemingray product} SB - No Photo✓
BT 2124NO EMBOSSING [010] [No embossing] {Circular head with three steps; smooth sides, no threading} {Hemingray product} SB - No Photo✓
BT 2125NO EMBOSSING [010] [No embossing] {Hex head, screw style} {Hemingray product} SB - No Photo✓
BT 2126NO EMBOSSING [010] [No embossing] {Hex head, screw style} {Hemingray product} SB - No Photo✓
BT 2127NO EMBOSSING [010] [No embossing] {Hex head, screw style} {Hemingray product} SB - No Photo✓
BT 2128NO EMBOSSING [010] [No embossing] {Hex head, screw style} {Hemingray product} SB - No PhotoMOST WANTED
($300 Reward)
BT 2129NO EMBOSSING [010] [No embossing] {Hex head, screw style} {Hemingray product} SB - No Photo✓
BT 2130NO EMBOSSING [010] [No embossing] {Hex head, screw style} {Hemingray product} SB - No Photo✓
BT 2131NO EMBOSSING [010] [No embossing] {Hex head, screw style} {Hemingray product} SB - No Photo✓
BT 2132NO EMBOSSING [010] [No embossing] {Tongue and groove design: insulator is split into two pieces with 3 protrusions on one side and 3 matching indentations on the other side} {Hemingray product} SB - No Photo✓