Number | Name | Date | Kind |
---|---|---|---|
D212242 | Paulus | Sep 1968 | |
D273964 | Roth | May 1984 | |
D321381 | Slayton | Nov 1991 | |
784888 | Reisner | Mar 1905 | |
1230263 | Alexander | Jun 1917 | |
2013395 | Wood | Sep 1935 | |
3280499 | Studen | Oct 1963 | |
3853321 | Claffie | Dec 1974 | |
4353700 | Volakakis | Oct 1982 | |
4361328 | Stein et al. | Nov 1982 | |
5074794 | Von Hagen | Dec 1991 |
Number | Date | Country |
---|---|---|
0844824 | Jun 1970 | CAX |
010043 | Jan 1895 | GBX |
2184027 | Jun 1987 | GBX |
Entry |
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"Visual and Tactile Discrimination Puzzles", Educational Design Associates, Inc. (Catalog), 1973, p. 2. |