Sentence 1: The photoelectric records were made by a partial reversal of the Tri-Ergon process , which was used to encode the audio track in the first place .
Sentence 2: The photoelectric records were made by a partial reversal of the Tri-Ergon process used to encode the sound track in the first place .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?