tape reading heads; one would read the text while the other controlled the spacing of the print. Spacing codes were stored in relays inside the machine as a line of text progressed. At least some Justowriters used carbon (as opposed to ink-impregnated fabric) ribbons to produce cleaner type, suitable for mass photo-set reproduction, sometimes referred to as cold type composition. The Line Casting Control or LCC product generated paper tapes for Linotype and Intertype automatic typesetters. In addition to punching a tape containing the text to be typeset, it turned on a lamp easily seen by the operator to show that the text on the line being typed could be typeset—it was within justifiable range. The LCC had a four-wheel rotary escapement, and a set of gears between the carriage rack and the escapement, to permit the smallest unit of spacing at the escapement to be quite small at the carriage. The spring-tensioned tape that moved the carriage had far more tension (possibly 20 lbs?) than did a standard Flexowriter. American Type Founders produced a phototypesetter based on the Justowriter/Flexowriter platform. Finance There was an "accounting" model with an ultra-wide carriage and two-color ribbon for printing out wide financial reports. The Friden accounting model was called "5010 COMPUTYPER" and was capable of arithmetic functions (addition, subtraction, multiplication & division) at electronic speeds and to print the results automatically in a useful document. Hardware As a cutting edge device of their time, Flexowriters, especially some of the specialized types like typesetters, were quite costly. They were made for extreme durability. There were porous sintered bronze bearings, many hardened steel parts, very strong springs, and a substantial AC motor to move all the parts. Most parts are made of heavy gauge steel. The housing and most removable covers were heavy die castings. While the final Singer models did make some use of plastics, even they were quite heavy compared to other electric typewriters of their time. As a result, the platen carriage was very heavy, and when the "Carriage Return" key was pressed, the carriage moved with about of force and enough momentum to injure a careless operator. If used only as manual typewriters, and properly maintained, Flexowriters might last a century. When reproducing form letters from punched tape, the considerable speed and loud sound of the device made watching it a somewhat frightening experience. Towards the bottom of the unit there