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NOVA, AN ALBERTA CORPORATION embarked on a research and development project approximately one and one-half years ago to develop a machine capable of stripping frozen topsoil . The result was a modified Rock-Saw which was used for topsoil stripping on the construction of three pipelines during the past winter. After minor operational problems on the first pipeline were alleviated, the machine was very successful in almost all respects and will be used in the future during pipeline construction on agricultural soils.