This paper describes the contributions of some of the companies involved on the Chevaline project. David Reade's paper deals with BAe's activities. The paper is not comprehensive, being based largely on personal recollections and not a thorough scrutiny of papers and files. I hope, however, that it will trigger other memories which can contribute to a more complete history. Any errors are mine. I apologise to those companies who only get mentioned in one table. I shall only be talking in any detail about Huntings, Sperry and the Rocket Propulsion Establishment. I hope that the contributions of companies such as AirLog, ML Aviation and Thorn EMI will get due recognition in a history.rnMarking the start in 1970, the only contractors then associated with the Polaris Improvement programme were Hunting Engineering (HEL), Sperry Gyroscope and Marconi Space and Defence Systems (MSDS). Before the Feasibility Study, a few individuals in industry, notably Paul Cope at HEL, where work was done under a pre-existing fluidics contract, were in discussion with RAE on various studies. As Feasibilty got under way, the main contributors were HEL and Sperry, with smaller companies such as ML Aviation and AirLog, together with the Rocket Propulsion Establishment (RPE, later PERME) making inputs.rnBy the end, important pieces had been developed and built in addition by many companies including: Bristol AeroJet (BAJ), MSA, Bell Aerospace in the US, RARDE and Dowty. For all the companies involved this was a big and important job, although there was not much prestige to be had. This was mainly because of the extreme security that flooded everything and everyone. But the contracts were all cost plus, so regular profits were probably made - although I haven't checked this point with company finance directors!
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