Patent information:

Patent:Utility 201,544
Patented:March 19, 1878
Applied:August 7, 1877
Title:Improvement in Insulators for Telegraph Wires
Description:Threads of segmented internal threads to match segmented pin
Category:Thread
Assigned to: 

Patentee Information:

MATTHEWMAN, Joseph Brooklyn, NY

Class and subclass information:

Class:174ELECTRICITY: CONDUCTORS AND INSULATORS
Subclass:206INSULATORS With terminal elements Pin type Screw or bayonet type Sockets;
Class:174ELECTRICITY: CONDUCTORS AND INSULATORS
Subclass:205INSULATORS With terminal elements Pin type Screw or bayonet type Soft yielding material pin;

Known specimens:

None known

Drawings:

Drawing page 1

Page 1