Patent information:

Patent:Utility 477,980
Patented:June 28, 1892
Applied:February 21, 1890
Title:Insulator
Description:Knob
Category:Knob
Assigned to:The Thomson-Houston Electric Co.

Patentee Information:

WIRT, Herbert C. Boston, MA

Class and subclass information:

Class:174ELECTRICITY: CONDUCTORS AND INSULATORS
Subclass:166RINSULATORS With insulator-supporting or attaching means Support penetrating Through aperture, penetrating element clamped;
Class:174ELECTRICITY: CONDUCTORS AND INSULATORS
Subclass:174INSULATORS With conductor holding means Insulator structure;

Known specimens:

None known

Drawings:

Drawing page 1

Page 1