Supply Of Impeller For Smoothing Reactor Blower (mvsl) As Per Drg. No. Elw/bsl/3/124.317, Alt.-1. Each Unit Should Be Emboss/engraved With Makers Name,month Year & Batch No. Manufacturing At A Conspicuious Place. Note: Only For Clw Approved Sources. Desription Changed As Per Bsl Letter Dtd. 21/11/2008.