Assertion: trembler coil | /r/HasProperty | developed by nicholas callan
Facets:
value: from a device
type: OTHER
value: in 1836
type: TEMPORAL
value: during the 1880s
type: TEMPORAL
Source sentences:
text: The trembler coil was an induction coil, developed during the 1880s from a device invented by Charles Grafton Page and independently by Nicholas Callan in 1836.