Document dDvj0gKVgB5Jxz1eyEY3X12m6

Ho. P. 226* 21st Novnaber, 1963. The Ganaral Superintendent, ---- ......-- Australian Blue Aabestoe Pty. ltd., mIB- Dear Six, CUST WZAflDt He understand that you m >v* * regularly stapling the dust concentration in the air at ' * points in the nine and mill using the isidget inpingex. Would you please forward us a copy of the results /of these tssts over the last few aonths indicating the . . > dust concentration and particle size of the satexial caught. k' 1 For your information {and for the nine) we enclose copies of a note written by Mr. H. Irving following his visit to the nine in Septeober. Yours faithfully. f JU n Wii l>2i WV-004242