import cadquery as cq
w0=cq.Workplane('YZ',origin=(-23,0,0))
w1=cq.Workplane('XY',origin=(0,0,47))
r=w0.sketch().segment((22,-50),(45,-50)).segment((45,50)).segment((22,50)).segment((22,36)).arc((-9,18),(22,-1)).close().assemble().reset().face(w0.sketch().segment((6,34),(17,0)).segment((19,1)).segment((8,35)).close().assemble(),mode='s').finalize().extrude(47).union(w1.workplane(offset=-16/2).moveTo(-12,-5.5).box(10,79,16))