maser
type: Concept
preferred label: میزر @fa
related: parametric devices

parametric amplifier
type: Concept
broader: parametric devices
preferred label: تقویت‌کننده پارامتری @fa

electron tube
type: Concept
preferred label: لامپ الکترونی @fa
related: parametric devices

parametric oscillator
type: Concept
broader: parametric devices
preferred label: نوسانگر پارامتری @fa

parametric devices
type: Concept
broader: electronic equipment
narrower: parametric oscillator
narrower: parametric amplifier
preferred label: افزاره پارامتری @fa
related: maser
related: electron tube

electronic equipment
type: Concept
narrower: parametric devices
preferred label: تجهیزات الکترونیکی @fa