brake-field tube

carbon nano-tube field emission display

crossed-field tube

inclined field tube

transverse field tube

critical field of a counter tube

field-emission tube

magneto field effect tube

Switch field-effect tube

sigma field (σ-field)

Residual magnetic field/field

Magnetic field/field

recessed tube-tube sheet

Tube-Tube Electrode

Tube-Tube Plate Welding

Tube-Tube Sheet

test tube test tube brush test tube holder test tube rack

a system of a major field of specialization plus a minor field

added electric field and magnetic field