Patent information:

Patent:Utility 297,101
Patented:April 22, 1884
Applied:October 18, 1883
Title:Insulator for Telegraph Wires
Description:Pin hole shaped to receive a keyed pin (advertisement eBay 4-2001)
Category:Pin
Assigned to: 

Patentee Information:

BALDWIN, Luther C. Manchester, NH
THURSTON, John C. Manchester, NH

Class and subclass information:

Class:174ELECTRICITY: CONDUCTORS AND INSULATORS
Subclass:194INSULATORS With terminal elements Pin type;
Class:174ELECTRICITY: CONDUCTORS AND INSULATORS
Subclass:202INSULATORS With terminal elements Pin type Screw or bayonet type;
Class:174ELECTRICITY: CONDUCTORS AND INSULATORS
Subclass:206INSULATORS With terminal elements Pin type Screw or bayonet type Sockets;

Known specimens:

None known

Drawings:

Drawing page 1

Page 1