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