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

It was because both the inventors of the products had to face rivalry when promoting their products. In order for their products to hit the market with excellent sales reports, both the inventors had to make an effort show off. Both inventors refined their products to make better versions and make them successful in the market. 

go

explanation:

because it can't be a slow, i would say possibly whoa, but there's nothing too surprising about orange juice, and because it tastes awesome it's a go drink, not food.

the answer is "began" because it is a action that can be done