| Original language | English (US) |
|---|---|
| U.S. patent number | 3405457 |
| State | Published - Oct 15 1968 |
Automated Teaching Machine
Donald L Bitzer (Inventor)
Research output: Patent
Donald L Bitzer (Inventor)
Research output: Patent
| Original language | English (US) |
|---|---|
| U.S. patent number | 3405457 |
| State | Published - Oct 15 1968 |