Title:
Interlocking structural unit
United States Patent 3172508
Inventors:
John, Doering
Finkel, Julian B.
Publication Date:
03/09/1965
Other Classes:
404/41, 244/114R
International Classes:
E01C9/08; E01C9/00
Foreign References:
| CA835260A | | | | |
| CA615818A | | | | |
| CA615819A | | | | |
| CA615820A | | | | |
| DE16305C | | | | |