Random triples
| Subject | Object |
|---|---|
| gptkb:Bell's_electric_phonograph | recording industry |
| gptkb:Whittle_engine | commercially viable by 1950s |
| gptkb:Phosphoric_Acid_Fuel_Cell_(PAFC) | limited commercial availability |
| gptkb:Direct_Fuel_Cell_(DFC)_systems | commercially available |
| gptkb:Perovskite_Solar_Cells | in progress |
| gptkb:Einstein_Refrigerator | limited |
| gptkb:Haber-Bosch_process | early 20th century |
| gptkb:Cx601 | available in select European countries |
| gptkb:AW609_Tilt_Rotor | Commercialization efforts ongoing |