Underwood Corp acquires the American assets of Powers-Samas. By the 1950s punched cards and unit record machines had become ubiquitous in academia, industry and government. The warning often printed on cards that were to be individually handled, "Do not fold, spindle or mutilate", coined by Charles A. Philips, became a motto for the post-World War II era (even though many people had no idea what spindle meant). With the development of computers punched cards found new uses as their principal input media. Punched cards were used not only for data, but for a new application - computer programs, see: Computer programming in the punched card era. Unit record machines therefore remained in computer installations in a supporting role for keypunching, reproducing card decks, and printing. 1955: IBM produces 72.5 million punched cards per day. 1957: The IBM 608, a transistor version of the 1948 IBM 604. First commercial all-transistor calculator. 1958: The "Series 50", basic accounting machines, was announced. These were modified machines, with reduced speed and/or function, offered for rental at reduced rates. The name "Series 50" relates to a similar marketing effort, the "Model 50", seen in the IBM 1940 product booklet. An alternate report identifies the modified machines as "Type 5050" introduced in 1959 and notes that Remington-Rand introduced similar products. 1959: BTM is merged with rival Powers-Samas to form International Computers and Tabulators(ICT). 1959: The IBM 1401, internally known in IBM for a time as "SPACE" for "Stored Program Accounting and Calculating Equipment" and developed in part as a response to the Bull Gamma 3, outperforms three IBM 407s and a 604, while having a much lower rental. That functionality combined with the availability of tape drives, accelerated the decline in unit record equipment usage. 1960: The IBM 609 Calculator, an improved 608 with core memory. This will be IBMs last punched card calculator. Many organizations were loath to alter systems that were working, so production unit record installations remained in operation long after computers offered faster and more cost effective solutions. Specialized uses of punched cards, including toll collection, microform aperture cards, and punched card voting, kept unit record equipment in use into the twenty-first century. Another reason was cost or availability of equipment: for example in 1965 an IBM 1620 computer did not have a printer as standard equipment, so it was normal in such installations to punch printed output onto cards, using two