An image forming unit includes an image forming device that forms an image on a recording medium disposed at a lower portion thereof, a device frame that supports the image forming device at the lower portion, having a first attaching portion to which to attach a first storage frame and a second attaching portion to which to attach a second frame. Either a first storage unit or a second storage unit is attached to the image forming unit. The first storage unit includes a first storage tray having a first storage capacity, a first guide member and the first storage frame. The second storage unit includes a second storage tray having a second storage capacity larger than the first storage capacity, the second guide member and the second storage frame.

 
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< Waveguide configuration

> Signaling gateway with multiple IMSI with multiple MSISDN (MIMM) service in a single SIM for multiple roaming partners

> Optical interconnect structure in a computer system and method of transporting data between processing elements and memory through the optical interconnect structure
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