It was hermetic and let makers augment the variety of pad lined holes. Müller designed a new form of clarinet with seven finger holes and thirteen keys. This allowed the device to play in any key with near equal ease. Over the course of the 19th century makers made many improvements to Müller's clarinet, similar to the Albert system and the Baermann system, all maintaining an analogous basic design. Modern contraptions may also have cork or artificial pads. The final development in the fashionable design of the clarinet utilized in many of the world today was announced by Hyacinthe Klosé in 1839. He devised a special association of keys and finger holes, which permit easier fingering. It was encouraged by the Boehm system built for flutes by Theobald Boehm. Klosé was so inspired by Boehm's invention that he named his own system for clarinets the Boehm system, even though it is alternative from the only used on flutes. This new system was slow to realize popularity but steadily became the ordinary, and today the Boehm system is used far and wide on earth except Germany and Austria. These nations still use an instantaneous descendant of the Mueller clarinet called the Oehler system clarinet.

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