Pickett N-515-T Electronic
Here is a scan of the promotional done by the ISRM
Pickett_N515-T_Electronic_CIE_Pamphlet.pdf
Next is the Manual Set for the N-515-T
Cleveland-Institute-515-T-Slide-Rule-Manual-Part-I.pdf
Cleveland-Institute-515-T-Slide-Rule-Manual-Part-II.pdf
Cleveland-Institute-515-T-Slide-Rule-Manual-Part-III.pdf
Cleveland-Institute-515-T-Slide-Rule-Manual-Part-IV.pdf
Click on the next links to see professional panoramic pictures of the N-515-T model
Click on the next links to see professional panoramic pictures of the N-515-T model