Based on the clue 'a silent comedian in talking pictures this marx br...', what is the answer?

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 significant advance in science like the polio va...', 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 film of this russian tale was released in...', what is the answer? What is referred to by 'a silent mob scene'? Based on the clue 'a silent movie title includes the last name of thi...', what is the answer? Based on the clue 'a silk textile with a short smooth surface or the ...', what is the answer?