Here is some information you may have already found.
http://bluebookofpianos.com/agesl.htm
LUDWIG
Ludwig grands, uprights and player-pianos and reproducing pianos are noted for handsome case designs and full resonant and sympathetic quality of tone, and this, together with the high quality of the action, has established their superiority and popularity. They are fine instruments in which there is distinctive character and high order of attainment. The famous Ludwig instruments are manufactured by Ludwig & Co. a company of practical piano makers, and the foremen of the factories have been given an interest in the business in order that they should have an additional and personal incentive to attain the highest efficiency in their respective departments. This company is of high standing and responsibility
The plant being one of the finest and best equipped in the world. Ludwig & Co. Is the originator of the Unit Valve Player Action with which the Ludwig player-piano is equipped. The unit system, which permits each valve to be removed separately, appeal not only to the executive, but to the maintenance man. It reduces the upkeep expense to a minimum, because its mechanism, in perfect playing condition, is simple and easy. All parts of the players' action are easily accessible from the front without removing the action. The Ludwig player-piano is easily operated and its accurate and sensitive action leaves an effect like that of the human fingers and thereby affords correct musical expression. The construction of this player, combining simplicity, strength and durability, insures lasting service. The players' action, while a part of the piano, in no way interferes with hand playing.
The Ludwig Piano was signally honored with a high award at the Paris Exposition of 1900 and it was given the highest award given to Ludwig pianos at the Pan American Exposition. Buffalo, N. Y., 1901, also the London Crystal Palace Exposition, London, England in 1902. A number of prominent artists and musicians have endorsed the Ludwig piano in terms of the highest praise.
Maybe this will help. weemskat