The narrator is holding a polished aluminum plate to which a copper coating is applied into which the actual grooves are cut. A blank copper master can be seen in the foreground.

The device behind the technician looks like it might be a film-transfer machine. The reason I suspect this is that there is a long cooling duct coming out of the top of it. This means that something was being cooled, like a Xenon bulb for motion picture (Theatre) presentation. Or it could be a machine designed to cut the round discs, and the duct is used to quickly remove metal shavings. I would have to see a picture of the machine up close to make a determination.
- Forrest Proctor

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