ล็อกอิน
Usa - 1959 - cement is loaded onto trains, trucks and barges for transport.
CIRCA 1980s - Many various types of mining machine guards are shown and a narrator emphasizes their importance
1970s: Conveyor belts and hoppers in mining operation. Pulleys and drives in mining operation.
CIRCA 1950s - Salt is used in road building, stabilizing the soil in a container and then on a rural road, near a farmhouse, in 1958.
CIRCA 1950s - Officials tour an oil refinery in Iran.
industrial construction dolly shots. Refinery montage
CIRCA 1970s - Machinery is used for most dangerous roles in mining, but when something must be done by hand, use safety precautions, in 1978.

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1950s: Industrial cement storage silo. Transport trucks parked around cement silo. Transport truck fills with cement.

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