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Steam turbines are large rotating machinery, with many blades, that convert steam power into rotary motion. In the interwar period, 1918 - 1939, they were used principally in power plants and naval propulsion, as far as I know.
How were they typically manufactured during this time? I'm especially interested in whether the blades were cast into molds, or else had to be forged and shaped by a machine. This has huge implications for cost.
Note I have a related yet much more specific question about steam turbine blade alloy.