NL97076C (Page 1 of 5)
This is page 1 of the Dutch version of the LEGO patent for the internal tube connections. (Full document available here).
What makes this really interesting is that it directly references the Kiddicraft patent for the self-locking building bricks GB633055 (left column, line 12).
The text basically states that the new LEGO design is an improvement over known designs without internal protrusions such as the Kiddicraft bricks.
I have not found the same reference in other translations of the patent.
NL97076C (Page 1 of 5)
This is page 1 of the Dutch version of the LEGO patent for the internal tube connections. (Full document available here).
What makes this really interesting is that it directly references the Kiddicraft patent for the self-locking building bricks GB633055 (left column, line 12).
The text basically states that the new LEGO design is an improvement over known designs without internal protrusions such as the Kiddicraft bricks.
I have not found the same reference in other translations of the patent.