1-. 1 CrUM n 'BKS FOR K. 1 /). I A' /./• . .1 M/'IJFIERS 4()7 



The 0AK5 tube is an outgrowth of the many years of development in 

 this general lleld by the Electronics group of the Bell Telephone Laboratories. 

 Contributions to the success of the development have been made by chem- 

 ists, physicists, mechanical engineers and electrical engineers too numerous 

 to mention individually and to whom the author is indebted for much of the 

 material presented. 



