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