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The Quiz: In which one of following year, optical fiber was patented "Fiber Optics" App (iOS, Android) with answers: 1997, 1888, 1952, and 1899 for taking online classes. Study inventions and inventors questions and answers, Google eBook to download free sample for distance learning.
In which one of the following year, optical fiber was patented?
Baby bouncer for prewalking was discovered by
The optical microscope was invented by
The first patent for bar code was issued by
In which one of the following year, alkaline storage batteries were invented?
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