This ad for the 511A and 512 appeared in the February 1949 issue of The Review of Scientific Instruments.

 

This ad for the 511AD and the 512 appeared in the March  and April 1949 issues of The Review of Scientific Instrument. "Nulli Secondus" is Latin for Second to None.

 

This nearly identical ad for the 511AD and the 512 appeared in the May 1949 issue of The Review of Scientific Instruments.  Nulli Secondus was replaced by the Tektronix Pledge which also appears as the Tektronix Creed.

 

This same ad for the 511AD and the 512 appeared in the June 1949 issue of The Review of Scientific Instruments.  The Tektronix Pledge now appears as white text on a black background.

 

This ad for the 511AD appeared in the July 1949 issue of The Review of Scientific Instruments.

 

This 511AD ad appeared in the September 1949 issue of Electronics.

 

This ad for the 512 appeared in the October issue of The Review of Scientific Instruments. INC does not appear in the Tek Bug but does appear in later ads.

 

This ad for the Direct Coupled Amplifier appeared in the December issue of Electronics.

 

This ad for the Type 105 Square Wave Generator also appeared in the December issue of Electronics.

 

This ad for the 512 appeared in the 1949 issue of Radio Master. It includes a smaller Inc to the side of the Tek Bug.