
Letters-Patent For Inventions
- Undertitel
- Why They Are So Often Worthless; How To Obtain Valuable Patents; How To Avoid The Losses And Disappointments (1883)
- Författare
- J. McC. Perkins
- ISBN
- 9781162103334
- Språk
- Engelska
- Vikt
- 364 gram
- Utgivningsdatum
- 2010-05-23
- Sidor
- 30