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If this is already decided, could you upload (tex, pdf or whatever) the characters needed and specify the file format that will be required for the production? I would then at least think about doing a quick web search for what I (and everybody else) could get for free or create in one or two days work...
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The issues were discussed in the article posted earlier:
Typography of Keys
The discussions have been going on here. We have the existing calculator labels. If you have an alternative please post it so that we can all evaluate it.
Edited: 10 Nov 2007, 9:24 p.m.
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My preferred alternative is the one you used in your excellent analysis: LaTeX's cmss. Why pay for something we can have for free?