A museum showcase includes a guide system for a sliding door, including upper and lower guide mechanisms. The upper guide mechanism includes primary and secondary rails. The upper guide mechanism also includes a first slide unit and a second slide unit. The first slide unit has a rolling member on an upper horizontal track of the secondary rail, and a sliding block engaged on a vertical track of the secondary rail. The second slide unit has a rolling member on a lower horizontal track of the primary rail, and a sliding block engaged on a vertical track of the primary rail. Thereby, the upper guide mechanism is extremely strong. The weight of the door, entirely supported by the secondary rail, is discharged on the first rail by the two slide units to transmit both vertical and horizontal loads.
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