Please see Aubrey Scoon's website about the fascinating theory concerning the Rife-Hewlett connection. www.scoon.co.uk/Electrotherapy/Rife/BeamRay/Analysis/hewlett.htm
The photographs below show the a replica of the audio oscillator used in the 1939 Beam Ray machine. This is also the design that launched the Hewlett-Packard company. Note that with the settings defined by Aubrey Scoon, the audio oscillator is overdriven to produce a square wave. So perhaps, a square wave was actually in use from the late 1930's onwards.
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BR-39 af oscillator.pdf - I built the audio oscillator directly from Aubrey Scoon's schematic, shown here.
BR-39 AF Osc PL.pdf - Here is the parts list that I used to build this unit.