fast construction procedure even when using unskilled labor application_number US 83418701 A description fig1 2 and 3 show the perspective side and top views of the stretcher corner end half block units respectively in accordance to the present invention fig1 a shows the perspective view of the stretcher block unit as can be seen from fig1 a there are a pair of sidewalls 1 2 interlocking means 3 4 5 6 on opposed ends of sidewalls male interlocking means located at one end of the sidewalls and female interlocking means located on the opposite ends of the sidewalls and a pair of transverse protruding end walls 7 8 fig1 b shows the side view of the stretcher block unit as seen from the side of transverse wall 7 while fig1 c shows the top view of the stretcher block unit fig2 a shows the perspective view of the corner block unit it shows a pair of sidewalls 9 10 comprising interlocking means 11 12 13 14 male interlocking means at one end of sidewalls and female interlocking means on the opposite ends of the sidewalls a pair of transverse end walls 15 16 a transverse web 17 and protrusions 18 fig2 b shows the side view of the corner block viewed from transverse wall 15 and fig2 c is the top view of the.