{HEAD ~ The present invention} solves {TAIL ~ the above described problems}, by providing modified polyester impregnated castings, which are resistant to the chemical and solvent attack of R22 and R12 
{ HEAD ~ The present invention } solves { TAIL ~ the above described problems } , by providing modified polyester impregnated castings , which are resistant to the chemical and solvent attack of R22 and R12
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