An interbody spinal implant made of cortical bone or a bone composite adapted for placement across an intervertebral space formed across the height of a disc space between two adjacent vertebral bodies. In this image forming apparatus, a paper conveyance passage extends upward from a lower portion of the recording sheet storage unit toward the recording sheet receiving unit. The WINS NG nodes combine microsensor technology, low power distributed signal processing, low power computation, and low power, low cost wireless andor wired networking capability in a compact system. If the count exceeds the capacity of the buffer, an error condition is forced, thereby reducing chances that errors are incurred into the data transfer.