Because you watched Popular Science L-7-4 Films like Popular Science L-7-4

With Gayne Whitman

At Arcata, California, testing technology for landing planes in fog. Also: a high-tech barber shop in Westwood Village, California; manufacture of precision steel gauge blocks in Eskilstuna, Sweden.

10 films to make you think, picked for people who liked Popular Science L-7-4.

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