Lever Age

Format: 16mm

Sound: sound

Description: Lever - Age Produced by Shell Oil Co; One Shell Plaza P O Box 2463; Houston; TX; 77001PC: SOC Year published 1947 Grade Level: P I J Distributed on media: 1 film reel (21 min.), optical sound, 16 mm. Color?B & W Length: 21 MIN Description: Traces man's use of the principle of the lever, from the early crowbar through its many refinements to the smooth running gears of today.

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