Construction Master IV, Version 1.0

    The Construction Master IV was manufactured in two versions--this is the first.  Both are well-equipped for construction calculations; the most obvious functional differences are the darker case color, the use of all lower case letters on this model and the "Ft-In" key function absent here but present on the upper-case version.
    In the world according to Calculated Instruments, it appears that Version 1.0 of a calculator comes with lower- and upper-case lettering on the front.  We find all capital letters, as well as some minor enhancements to functionality, in Version 2.0.

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