Company Portfolio

Automatic Electric Co

Patents indexed

Year range

1925

telecommunicationsmechanical

Key Inventors

Bernard D Willis1

All Patents

Career timeline

1 patents, in 1925

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1925 — How Early Telephone Systems Managed Busy Lines Automatically

US 1537326·1925

How Early Telephone Systems Managed Busy Lines Automatically

A 1925 patent describing a mechanism to automatically signal that a telephone line is occupied, preventing callers from interrupting an active conversation.

Patent monitoring

Automatic Electric Co

1 patents, in 1925

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