Are time signature used to indicate where specific notes fall on the staff

no.

Explanation:

time signature is used to mark the number of notes a measure can have

1. eadweard muybridge creates series photography - 1877

2. the kinetograph - 1889

3. philo farnsworth - 1929

4. kodak introduces kodachrome - 1935

5.   once upon a time in mexico was the first film to be shot digitally - 2003

i hope this ! : )