Interlocking extruded wall panelling

Claim 1

WALL SURFACING PANELLING COMPRISING AT LEAST TWO EXTRUDED SECTIONS HAVING PANEL-LIKE MAIN BODY PORTIONS TERMINATING IN EDGE PORTIONS PROVIDED WITH PROFILE CONFIGURATIONS ADAPTED TO BE ASSEMBLED INTO INTERLOCKED ENGAGEMENT OF FORM AT LEAST A PORTION OF A PANEL, SAID EDGE PORTION OF A FIRST OF SAID SECTIONS INCLUDING A CHANNEL OF APPRECIABLE DEPTH EXTENDING THEREALONG AND FACING OUTWARDLY OF ONE SIDE OF SAID BODY PORTION OF SAID FIRST SECTION AND A PAIR OF OPPOSED LOCKING RIDGES EXTENDING ALONG AND ADJACENT THE UPPER EDGES OF THE INNER SIDES OF THE SIDE WALLS OF SAID CHANNEL, THE SIDES OF SAID RIDGES FACING THE BOTTOM OF SAID CHANNEL BEING SUBSTANTIALLY PLANAR AND DISPOSED AT AN ANGLE OF THE ORDER OF 90* TO SAID CHANNEL SIDE WALLS, SAID FIRST SECTION BODY PORTION BEING SUBSTANTIALLY FLUSH AND MERGING WITH THE UPPER EDGE OF ONE OF SAID CHANNEL SIDE WALLS, THE EDGE PORTION OF A SECOND OF SAID SECTIONS INCLUDING A FLAT PORTION CONSTITUTING AN EXTERSION OF SAID BODY PORTION OF SAID SECOND SECTION AND A PAIR OF SPACED LOCKING RIDGES EXTENDING ALONG SAID FLAT PORTION, THE OUTER SIDES OF SAID FLAT PORTION RIDGES BEING UNDERCUT AND GENERALLY COMPLEMENTARY TO SAID CHANNEL RIDGES AND THE MAJOR DISTANCE BETWEEN SAID OUTER SIDES OF SAID FLAT PORTION RIDGES BEING SLIGHTLY GREATER THAN THE MINOR DISTANCE BETWEEN SAID CHANNEL RIDGES, THE CONSTRUCTION AND ARRANGEMENT OF SAID EDGE PORTIONS BEING SUCH THAT SAID FLAT PORTION RIDGES CAN BE FORCED INTO SAID CHANNEL AND SPREAD THE SAME UNTIL SAID CHANNEL RIDGES SNAP INTO THE UNDERCUT PORTIONS OF SAID FLAT PORTION RIDGES AND FIRMLY LOCK SAID SECTIONS TOGETHER AGAINST RELATIVE TRANSLATIONAL MOVEMENT NORMAL TO THE JOINT THEREBETWEEN.