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Ceramic telegraph wire insulators.
Similar to their glass counterparts porcelain insulators date back to before the civil war for telegraph wires.
Lot of 3 vtg antique ohio brass knox guy wire insulators ceramic porcelain brown.
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Vintage electric ceramic glaze telephone telegraph pole insulator cap brown 19 49 1900 s hemingray 42 usa 24 48 telephone insulator 4 x 3 5 glass bead bottom.
Vintage insulators are most commonly made out of porcelain or glass materials and they come in a wide variety of colors and shapes making each item a unique.
Vintage hemingray glass insulator no.
19 blue green usa telegraph phone electric.
Vintage porcelain glass insulator with telegraph wire still attached.
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Electric wire insulator brown porcelain ceramic telephone telegraph railroad railway farm threaded lag bolt antique electricity utility.
Nice blue telegraph glass insulator cd 565 1 ussr soviet russian.
In north america glass was always the predominate material for communications insulators but porcelain has become the standard for power distribution due to its greater strength and surface resistance.