Original oil and gas trade magazine vintage ad for HALLIKAINEN INSTRUMENTS, INC. Main office was located at 1341 Seventh Street, Berkeley, CA. Continuous Vapor-Pressure Recorder pays out in one to three months. Continuously samples and records the vapor pressure of gasoline or liquefied gases in a flowing stream. This unique 1959 old petroleum products refining industry magazine advertisement would display beautifully matted and framed. Nice graphics.