 Outside of the United States, they were manufactured in greater numbers than the consoles, and hence were more widely used.Several different types of M series instruments were produced between 1948 and 1964; they contained two 44-note manuals with one set of drawbars each, and a 12-note pedalboard.The M model was produced from 1948 to 1951, the M-2 from 1951 to 1955, and the M-3 from 1955 to 1964.