Statements (13)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:US_patent
|
| gptkbp:applicationDeadline |
1877-12-24
|
| gptkbp:assignee |
gptkb:Thomas_A._Edison
|
| gptkbp:country |
gptkb:United_States
|
| gptkbp:fieldOfInvention |
cassette tape
|
| https://www.w3.org/2000/01/rdf-schema#label |
US200521A
|
| gptkbp:inventedBy |
gptkb:Thomas_A._Edison
|
| gptkbp:patent |
200521A
|
| gptkbp:publicationDate |
1878-02-19
|
| gptkbp:status |
expired
|
| gptkbp:title |
Improvement in phonograph or speaking machines
|
| gptkbp:bfsParent |
gptkb:Edison_tinfoil_phonograph
|
| gptkbp:bfsLayer |
7
|