| Manufacturer: | 
  Patco | 
  | Country of Manufacture: | 
  U.S.A. | 
  | Type: | 
  Mark IV  data log | 
  | Number: | 
    | 
  | Date of Manufacture: | 
    | 
  | Scales: (Front) | 
  K, Sq-odd, Sq-even, A, [ B, T, ST, S, C, ] D, DI, Th, Sh2, Sh1 | 
  | Scales: (Back) | 
  LL0+, LL0-, LL1+, LL1-, DF, [ CF, CIF, L, CI, C, ] D, LL2+, LL2-, LL3+, LL3-  | 
  | Number of Scales: | 
  29 | 
  | Gauge Points: | 
  π, e, q, s, s', R  | 
  | Slide Rule made from: | 
  Plastic with Metal End Pieces | 
  | Cursor made from: | 
  Plastic | 
  | Cursor Lines: | 
  1 front, 1 back | 
  | Overall Length of Rule: | 
  31.5 cms | 
  | Length of Scales: | 
  24.8 cms | 
  | Width: | 
  5.4 cm | 
  | Depth: | 
  0.5 cms | 
  | Weight: | 
    | 
  | Acquired from: | 
  Sphere Research | 
  | Date: | 
  Mar 2003 | 
  | Condition: | 
  Good | 
  | Accessories: | 
  Leather case. Good condition
  | 
  | Comments: | 
   Split square root scales like the Versalog and Deci-lon.
 Clearly styled on the sloped side K+E Deci-lon body and case design
  |