Inventions MCQs (Grade 8) From Textbook
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The MCQ: In which one of the following year, half tone engraving was patented; "Half Tone Engraving" App Download [Free] with answers: 1806, 1857, 1869, and 1813 for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Google eBook (Free Chapter) for school certificate.
In which one of the following year, half tone engraving was patented?
Halftone engraving was patented by
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