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I wonder then if New Record actually made their own engines or whether they just white labelled some stuff from Buzacott et. al
G'day Geoff
That requires a considered answer, and I have thought about this
for some time ...

Time-and-time-again I have noted examples of incestuous relationships between
companies. I also point out that private commercial contracts generally remain private.
We connect the dots from other evidence.

Buzacott is, itself, a prime example of this.
Manufacturers: yes. Re-branders: yes.

This practice seems to have arisen late 19th century, when modern advertising
techniques emerged. It is much older than we think. It is ubiquitous nowadays.

I cannot find evidence that New Record made there own engines.
... Maybe they did, though ...

A great question Geoff!
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Jack