Inventions e-Book's MCQs - Complete
Half Tone Engraving Quiz App Free Download & e-Book - 329
Apps:
MCQ:
Halftone engraving was patented by
- Sir Nikola Tesla
- Sir Desbarats
- Sir William Augustus Legge
- both b and c
d
Inventions App & e-Book Tests PDF Download
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General Knowledge MCQs eBook Download
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