Vacuum-tubes
notation: TK7871.72-TK7871.79
notation: TP159.V3
notation: TK6565.V3
type: Concept

Vacuum-tube circuits
created: 1986-02-11T00:00:00
member: collection LCSH General
member: collection LCSHAuthorizedHeadings
broader: Electric circuits
broader: Vacuum-tubes
alternative label: Thermionic valve circuits
in scheme: lcsh
type: Concept

Electric circuits
notation: QC601
notation: TK3001-TK3226
type: Concept