Doran, William E. "Construction Block." U.S. Patent number 4577447. Washington DC: United States Patent and Trademark Office, 1986.
Doran, William E. "Construction Block." U.S. Patent number 4577447. Washington DC: United States Patent and Trademark Office, 1986.
license
identifier
2000075447
created
2013-05-06T09:36:57
license
title
Doran, William E. "Constructio ...... t and Trademark Office, 1986.
shortTitle
Doran, Construction Block (1986)