Will it sell? how to determine if your invention is profitably marketable (before wasting money on a patent)
| Prif Awdur: | |
|---|---|
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
Okemos, Mich.
J.E. White & Associates
2000.
|
| Pynciau: |


