Number | Date | Country | Kind |
---|---|---|---|
111874 | Jul 1981 | CHX |
Number | Name | Date | Kind |
---|---|---|---|
2002311 | Corwin | May 1935 | |
2577215 | Smith et al. | Dec 1951 | |
2629135 | Johnson | Feb 1953 |
Number | Date | Country |
---|---|---|
2277936 | Feb 1976 | FRX |
Entry |
---|
Pictorial, Concrete Masonry/Paving Block Publication, .COPYRGT.1980, p. 7, bottom right. |