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1926 Professor Fuller’s Fuller Cylindrical Slide Rule Model 2 No. 5706 

We may identify the model as follows: The Model 1 (http://sliderules.lovett.com/fullertype1/fullertype1pics.htm )- see also manual p 4 - this model has no scale on the inner cylinder which is occupied by a table of useful data.)  The Model 2 has an extra sine and log scale on the inner cylinder (as does this one).