IPC 2013 : E01D 101/20 : Concrete, stone or stone-like material.

IPC2013 > E > E01 > E01D > E01D 101/00 > E01D 101/20[1] > Concrete, stone or stone-like material.
Notes[t] E01 - E06: BUILDING
E SECTION E — FIXED CONSTRUCTIONS.
E01 CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES.
E01D BRIDGES (bridges extending between terminal buildings and aircraft for embarking or disembarking passengers B64F 1/305).
E01D 101/00 Material constitution of bridges.
E01D 101/20 · Concrete, stone or stone-like material.