2013-08-07 09:42 Spinningspark 1076×994 (56367 bytes) {{Information |Description=A symmetrical T-section added to a symmetrical or antimetrical ladder of identical sections remains symmetrical or antimetrical respectively. |Source=Self created using Inkscape |Date=7th August 2013 |Author=~~~ |other_versio...
{{Information |Description=A symmetrical T-section added to a symmetrical or antimetrical ladder of identical sections remains symmetrical or antimetrical respectively. |Source=Self created using Inkscape |Date=7th August 2013 |Author=~~~ |other_versio...