Seat furniture for stretching of frontal body muscles, seat and backrest with variable opening angle between seat and backrest at seating positions and stretching positions
摘要
<p>The seating furniture (1) has a seat (2) and a backrest (3) with a variable opening angle between seat and backrest. The seat and backrest are set to seating positions with an opening angle 180[deg] and stretching positions with an opening angle of 180[deg] .</p>
