This model: Balloon sealing device (1945) (US2396906A)
Project Expired patents - "Reviving Forgotten Inventions" I search Google Patents for intriguing expired patents and bring them back to life—because I believe they’re either interesting, funny, or genuinely useful. Once I find a design…
- Pobrania
- 34
- Polubienia
- 6
- Ocena
- 5


