Model Engineer Index 1898 to Feb 2025

Year 1928
Date 22-Mar
Volume 58
Issue 1,402
Page 272
Category Electrical
Part 3
Title Practical Private Telephone Installations at Low Cost
Author B.Clements Henry
Notes Switch Gears. The same (choke-fault type), "metallic circuit" or double-line switch, commutator-push (new system), details, a new device