Multiple choice general knowledge

What was Thomas Edison's last patent?

  1. electroplating apparatus

  2. holder for article to be electroplated

  3. dynamo-electric machine

  4. apparatus for producing storage-battery electrode elements
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Edison's last patent (U.S. Patent 1,908,327), granted in 1933 shortly before his death, was for a holder used in the electroplating process. This reflected his continued interest in practical industrial applications even late in his career, working on improvements to manufacturing processes.

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