 | patented improvements on typewriters, marginal pagination of manuals, the "Puntero Proyectable" ("Projectable Pointer"), and the "Proyector Didáctico" ("Didactic... 115 KB (12,595 words) - 00:20, 19 April 2024 |
| patented improvements on typewriters, marginal pagination of manuals, the "Puntero Proyectable" ("Projectable Pointer"), and the "Proyector Didáctico" ("Didactic... 115 KB (12,595 words) - 00:20, 19 April 2024 |