For what does the world owe Almon Strowger a debt of gratitude?

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Question: For what does the world owe Almon Strowger a debt of gratitude?

1.Parking Meters

2.Vending Machines

3.Automatic Telephone Exchanges

4.Traffic Lights

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  1. For what does the world owe Almon Strowger a debt of gratitude?
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