Henry Ford was an early pioneer of the concept of the "production line" when he used it to construct the Model "T" Ford, at an affordable price and which you could have in any colour as long as it was black.

It is interesting to see that the spot welding of aluminium was used to speed up production as an alternative to drilling/riveting in order to join aluminium parts/panels together more quickly. They must have had close and strict quality control processes in place for the spot welding because it was aluminium which is more difficult to successfully spot weld than steel and also because it was for aircraft use and, therefore, potentially safety critical.
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