Patent 1904000427

Improvements in electric selecting or selecting and signalling systems for communicating between a central or main station and various other places or substations, and for performing various operations at such places or substations

Information

Australian application number
1904000427
Country
ZZ
Status
n/a
Type
Standard
Applicant
Robert James Sheehy, Alfred George Curphey,
Application year
1904

International Patent Classification (IPC) codes