Wow - thanks everyone for the education. I was going to respond after the first 
few emails came in, but then they just kept coming. Thank you all for going 
above and beyond. Once I can digest all of this I might have questions, but in 
the meantime I’m very grateful for everyone’s insight.
Best,
JW

Dr. Jonathan Walley
Associate Professor and Chair
Department of Cinema
Denison University
https://denison.edu/people/jonathan-walley


> On Nov 11, 2024, at 7:35 PM, [email protected] wrote:
> 
> 
> The oldest A&B rolls I’ve seen are from sometime in 1939-40 from Calvin 
> Company in Kansas City. I think if one looks in SMPTE they may find an 
> article about this technique in 1937-38.
> 
> Rick
> 
> 
> Rick Prelinger
> Prelinger Library & Archives, San Francisco
> www.prelinger.com
> www.prelingerlibrary.org
> [email protected]
> 
> Emerit Professor, Film + Digital Media
> UC Santa Cruz
> [email protected]
> 
> 
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