A threaded joint for steel pipes for use in an oil well which has improved galling resistance and which is protected from rusting comprises a pin and a box each having a contact surface including a threaded portion and an unthreaded metal contact portion. The filter comprises a monolayer of immobilized chelating agent on packed silica gel. A biological sensor such as a camera may obtain biological data describing a human patron. The first voltage suffices to switch the gate dielectrics of the selected devices from the first to the second polarization state and the second voltage does not suffice to switch the gate dielectrics of the non-selected devices. The electronic device comprises electronic circuitry operative to perform the method of the invention.