A dramatist is an author of a dramatic composition, usually plays. The term is usually reserved for those who have written "serious" plays (as opposed to comedies or farces, whereas the simpler term, "playwright", is more all-embracing.
... a smaller extent by the slipping friction.
The device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,311 (1998) ...