Telecommunications history: For what invention does the world owe Almon Strowger special thanks? Focus on his key contribution to automating telephone exchanges. Choose the correct description.

Difficulty: Easy

The automatic telephone exchange (Strowger step-by-step switch) enabling dial telephony
The electric light bulb for household use
The electromagnetic telegraph
The first practical radio receiver

Correct Answer: The automatic telephone exchange (Strowger step-by-step switch) enabling dial telephony

Explanation:

Given data

We need Almon Strowger's core invention.

Concept / Approach
Strowger invented the automatic telephone exchange (the Strowger switch), replacing human operators and enabling direct dial telephony.

Final Answer
The automatic telephone exchange (Strowger switch).

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