TR  / RI-9377 <br/>
E. K. Hjelmstad <br/>
       Ultra loue frequency electromagnetic fire alarm system for underground mines 
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<br/><U>Author Added Entry: </u><br/>H. W. Pomroy;
<br><U>Copy Details:</u><br> Acc. No.: <b>TR6759</b>, Full Call No.: TR RI-9377,   Item type:  Technical Report , Location: General Stacks, <br><b>------------------------- --------------------- ------ --------- ------- ------- --------- -------- </b><br>