A polyimide film which rarely undergoes the formation of bubbles, blisters or the like, even when heated to a high temperature; and a production method and a production apparatus for the polyimide film. The storage rack is supported on a wall surface with extensible and pivotal deployable equipment engaging extensions for receiving baseball equipment. One method of producing the shaped beam is by using a two lens system, the first lens imaging the source onto the plane of the second lens and the second lens forming an image of the aperture onto the target plane. Connecting edges on each portion are then connected together, thereby causing the two attached ends of the fabric to be brought together for seaming. The optical sensor detects the brightness of the light output from the facing surface. In order to construct a filter mask, the method further comprises causing a card of the \u201cseparator\u201d type to advance past the camera, which card has a face on which said region of interest is represented.