31. If oil based mud is used and water is displaced, deeper logs will show higher conductivity than the invaded zone. 32. In 2004, the college installed a carbon neutral biomass heating system to replace an aging and unsustainable oil based system. 33. Soon he was collapsing on a regular basis and was advised by his doctors to stop using oil based pigments. 34. The paint had a linseed oil base , and feathers and combs were dragged over it to create the grained effect. 35. It left an offshore oil base near Bergen, the main city on Norway's west coast, on Monday morning, Halliburton said. 36. The tramp oil accumulation separates from the aqueous or oil based coolant and can be easily removed with an absorbent. 37. These oil based fluids often oxidize and form a sludge during quenching, which consequently lowers the efficiency of the process. 38. GOI still produces and sells a wide range of branded oil based products including lubricants and greases of all kinds. 39. They are mixed in a coconut oil base that some arthritis sufferers say carries the herbs deep into damaged joints. 40. Meanwhile, in 1942, Oil Base Drilling Company was founded by George Miller, and made its first application of oil base mud.