How is the process of refining and marketing the phonograph similar to the development of the audio spotlight

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asked Aug 26, 2018 37.8k views

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Eladio · Answer 1 · 2018-08-31T23:42:44+0000

it was because both inventors of the products had a face rivarly when promoting their products,. in order for their products to hit the market excellent sales report

How is the process of refining and marketing the phonograph similar to the development of the audio spotlight

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