OG 2016 Tracker >>> OG2016 Sentence Correction Video Solutions (OG Diagnostic)



OG 2016 Numbering:
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OG2016 SC Diagnostic #40.
In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics.
laws, an observation about electric current first made in 1845 and
laws, which was an observation about electric current first made in 1845 and it is
laws, namely, it was an observation about electric current first made in 1845 and
laws, an observation about electric current first made in 1845, it is
laws that was an observation about electric current, first made in 1845, and is
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