Original oil and gas trade magazine vintage ad for NATIONAL TANK COMPANY. of Tulsa, OK. Produce 3-dual completed wells. Each storage tank contains a set of vertical coils used as heat exchangers. Hot water is circulated thermosiphonically between water bath of direct fired heater and tank coils. Gas from the distillate zone is used to gas-lift adjacent leases. This unique 1959 old oilfield petroleum industry magazine advertisement would display beautifully matted and framed. Nice graphics.