Abstract: A rotation adjustment system for seats includes a first viewing chair and a second viewing chair. The first viewing chair includes a first seat part and a first backrest part which is stood from the first seat part to maintain the seating function of the first seat part, and is laid down toward the first seat part to disable the seating function of the first seat part. The second viewing chair includes a second seat part and a second backrest part which is stood from the second seat part to maintain the seating function of the second seat part, and is laid down toward the second seat part to disable the seating function of the second seat part.

Abstract: A rotation adjustment system for seats according an embodiment of the present invention includes a first viewing chair and a second viewing chair. The first viewing chair includes a first seat part and a first backrest part which is stood from the first seat part to maintain the seating function of the first seat part, and is laid down toward the first seat part to disable the seating function of the first seat part. The second viewing chair includes a second seat part and a second backrest part which is stood from the second seat part to maintain the seating function of the second seat part, and is laid down toward the second seat part to disable the seating function of the second seat part.

Abstract: A movable spectator's stand with an auxiliary spectator's stage, wherein the auxiliary spectator's stage is foldably connected to the front part of the lowermost spectator's stage of multistage spectator's stages, thereby, when the movable spectator's stand is in use, increasing spectator capacity in proportion to the dimensions of the auxiliary spectator's stage, and, when the auxiliary spectator's stage is folded and covers the front surface of the movable spectator's stand after the movable spectator's stand is retracted, defining a smooth and clean external appearance and preventing safety accidents generated due to the approach of children thereto.