invention year

URI: https://gptkb.org/prop/invention_year
6 triples
GPTKB property
Random triples
Subject Object
gptkb:Electron_Capture_Detector 1957
gptkb:Strobe 1931
gptkb:Multi-mode_Fiber 1970s
gptkb:Relay 1835
gptkb:Barker_lever 1839
gptkb:Brake 1869