MATH PUZZLE: Can you replace...
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 197
The first user who solved this task is Thinh Ddh.
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Rectangular TV tube productionIn 1949, the first deliveries were made of the first practical rectangular television tube made in the U.S. The tubes were manufactured by the Kimble Glass Co., a subsidiary of Owens-Illinois, and sold for about $12. The display face of the tube measured approx. 12in. by 16in. The company had announced the tube to the trade on 10 Jul 1949. |