Original oil and gas trade magazine vintage ad for UNIVERSAL ATLAS CEMENT COMPANY. of NewYork City, NY. Unaflo Protects your Oil Investment 3 ways when the heat is on. It stays fluid and pumpable under highest bottom-hole temperatures and pressures, sustained fluidity, after retardation, a heavy slurry hardens normally to form denser, impermeable seal. This unique 1950 old petroleum oilfield drilling equipment magazine advertisement would display beautifully matted and framed.