Show for T 1 HE a E CHILSON I 1 L 0 N PROCESS OCE for locating and defining sulphide ore bodies by radio electrical surveys is thornly countries protected by patents granted in the united states and possessions and in twenty two foreign the basic patent granted in 1924 thornly covers the inductive method of locating and denning defining sulphide ore bodies subsequent patents cover the use of and apparatus for utilizing radio waves in the further refinement and operation of the chilson process due to the delicate nature of the apparatus and the technical skill necessary to intelligently operate it and interpret the results obtained it has not been found practicable to lease or sell apparatus used in in the chilson process accordingly any person purporting to offer such apparatus for sale or lease is isi doing so without authorization and any unauthorized person attempting to use the apparatus for geophysical surveys will face immediate prosecution for patent infringement for those interested it will be an economy to consult the patent office it CARL VV CHILSON co developer of the chilson process 06 dooly building salt lake city utah 4 BEAR BRAND PRODUCTS fo for r FLOTATION U UNIFORM N I 1 F 0 R M ireat great western electro chemical co NO 9 MAIN ST SAN FRANCISCO CALIF are always used to advantage for initial installations and replacements demanding ECONOMY in service powell iron body pilot gate P valves are obtainable with bronze working parts or all iron for special requirements A long acme thread is machined on oil stem same as furnished on all powell gate valves F F discs are made with ball and socket back and self adjusting to seating surface body and bonnet are firmly bolted together special features for long uninterrupted service are built into every powell product design workmanship and continuous development for betterment of product attained through more fig than eighty years of successful L I 1 B 19 pilot gate valve endeavor sized 1411 to 3 lbs ibs IV S P THE WM POWELL CO 2521 IL s P ring grove ave cincinnati OHIO V U S A |