Properties (5)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
patent
|
| gptkbp:filedIn |
unknown
|
| https://www.w3.org/2000/01/rdf-schema#label |
US 2,444,446
|
| gptkbp:issuedBy |
unknown
|
| gptkbp:isUsedFor |
unknown
|