Document 37D7Y26k9j05364mYYeQO2BZD

toz y 1 <C <C <c Ptxm7s . p.g# 20th December, 2963. tbs General Manager, Csr.m3.2x.t.Building Materials Division, Dear Sir, PUSt HAZARD - Tear P.230: Tom* rswto are noted snd m shall vnan Tor a Med Mt of ocoats to be fres th ansa points after the acnpletion of the Aaeriet lasts11*ties, * Th0 readings quoted range from vary low counts up to figures of 1000 plus. Cals ia am extresely wide rung*, but tbs telioctag table any bend to clarify the position txt*B tba Mines Departoent point of view - Acceptable J 0 - TOO particles. It aay be of interest to note that tin average const for tbs V.a. Brining industry over tbe ;sot two years baa 1961 - 274 jertidea 1962 - 30S Qd tbe question of a "safe" dust count, this Bust be viewed with a certain amount of caution, since a figure of TOO Ertlclse at Vltteaoom in quartrite notorial la far acre ageroua than a aisilar figure say in Collie, is a general rule, all these associated with the control of dust end industrial diseases regard a count of 300 aa satisfactory. ThUang to Dr. McNulty on the question of lung diseases teongat our all! and atine employees, hla gemral coBnset was that fibs years 1954 - 58 ware bed, aai that in his opinion VW-004246 w cben baa baan a ataady issroraaont in avceaadlDg y*ara Za this raopaet'm ara now awaiting *h* actual atatlatioa fro* tee Kina# Da;arts8t. Youra faithfully. For AUSTHAilAH BIOS iSSBSJOSPTT. LTD, ( C