| 摘要 |
<p>Building block (10) having a first front face (11) and a second rear side (12) opposite said front face (11). An upper side (13) extending between said front face (11) and said rear side (12) is formed with a ridge (14) along the complete length of the building block (10) at said rear side (12), so as to prevent mortar on said upper side (13) from being pressed out on said rear side (12).</p> |
