import cadquery as cq
w0=cq.Workplane('YZ',origin=(12,0,0))
r=w0.sketch().segment((-50,4),(-19,4)).segment((-10,-25)).segment((50,-5)).segment((38,30)).segment((38,34)).segment((37,34)).segment((35,41)).segment((15,34)).segment((-50,34)).close().assemble().finalize().extrude(-25).union(w0.sketch().segment((4,-36),(17,-41)).segment((29,-6)).arc((22,-6),(16,-2)).close().assemble().finalize().extrude(-19))