ac nominal phase-phase potential transformer

ac phase-phase

Cine phase-contrast

cine-phase contrast

differential phase contrast microscope

in-line phase contrast

in-line phase contrast imaging

interference phase contrast microscope

inverted phase contrast microscope

laboratory phase contrast microscope

linear-phase filter

liner-phase filter

Microwave linear-phase filter

minimal phase filter

minimum phase filter

multi-phase filter

Multi-phase filter banks

multi-phase filter-bank

negative phase contrast