Prosurvival and prodeath effects of hypoxia - inducible factor - 1 stabilization in a murine hippoca

This invention pertains to a method and apparatus whereby, when a thoroughfare is to be resurfaced, the covers for the openings that extend downwardly beneath such thoroughfares may be raised to a level corresponding to the raised level of the resurfaced thoroughfare. Such raising is accomplished without the need for digging up the framework that supported the cover.