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"la correspondance cinéma-phono-télégraphique" was a good guess. That's exactly our modern video calls, except with smaller devices.

"La curiosité" is a good one too, most city kids are seeing a horse like they would see a lion

A few were not very insightful, but likely obvious to anyone paying attention.

Automobiles de guerre: tank were already right around the corner, 15 years away.

Audition du journal: commercial broadcasting was 20 years away, with early efforts starting as soon the early 1900s.