Which company invented the coffee vending machine?

Manning & Lewis
Knapway Devices
Bert Mills Corporation
Rudd-Melikian
The machine was invented in the United States by the Rudd-Melikian company in 1947, debuting as the "Kwik Kafe". Several U.S. companies also began manufacturing the machines in 1947, and by 1955 over 60,000 existed in the U.S. Today, coffee vending machines exist in various areas of the world, and are very common in Japan.
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Answers by country

Manning & Lewis
Knapway Devices
Bert Mills Corporation
Rudd-Melikian
answers
flagPoland
22%
21%
33%
22%
498
flagthe United States
12%
37%
37%
12%
16
flagAustralia
50%
0%
40%
10%
10