A method of manufacturing a coil unit includes the first step of disposing a coil between a first frame and a second frame, the second step of pouring liquid resin into between the first frame and the second frame with the coil disposed therebetween, and the third step of curing the liquid resin to thereby fix the first frame, the second frame and the coil to one another. A hologram reproduction apparatus using a holographic reflector includes a light, a holographic reflector, an adjustor, and a hologram. Each of the pixels has a transparent sub-pixel and a reflective sub-pixel, while the transparent sub-pixel further has a transparent electrode and a first thin-film transistor, and the reflective sub-pixel has a reflective pixel electrode and a second thin-film transistor. Additional software is disclosed for deriving an initial three-dimension velocity vector and spin rates about both horizontal and vertical axes of a free ball similarly struck whereby a three-dimension trajectory of a free golf ball may be computed. Separate swivel connections are coupled in fluid communication with the coolant supply and return manifolds for facilitating supply and return of coolant to and from the manifolds, and for facilitating pivotal movement of the doors relative to the electronics rack.