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Erard repetition action after the English patent drawing of 1821; the intermediate lever, pivoted to its flange, simultaneously lifts the hopper and pulls down the damper; the action is shown with the key depressed, the hammer having fallen back to its ch
Erard repetition action after the English patent drawing of 1821; the intermediate lever, pivoted to its flange, simultaneously lifts the hopper and pulls down the damper; the action is shown with the key depressed, the hammer having fallen back to its check
