Based on the clue 'a significant advance in science like the polio va...', what is the answer?

What is associated with: a sign that says get in here greets you at the fog city diner located at 1300 battery st in th… What is referred to by 'a signal fire'? Based on the clue 'a signal that means cameras are running or a traff...', what is the answer? Based on the clue 'a signer of the declaration of independence he ser...', what is the answer? Based on the clue 'a silent butler is used to collect these during or...', what is the answer? Based on the clue 'a silent comedian in talking pictures this marx br...', what is the answer? Based on the clue 'a silent film of this russian tale was released in...', what is the answer? What is referred to by 'a silent mob scene'?