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 e-Book (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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