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The following categories exist in the wiki.

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1. 10 Inch Straight Rules ‎(70 members)
2. 20 Inch Straight Rules ‎(1 member)
3. 6 Inch Straight Rules ‎(12 members)
4. 8 Inch Straight Rules ‎(1 member)
5. Abaci ‎(2 members)
6. AcuMath ‎(2 members)
7. Adders ‎(7 members)
8. Addiator ‎(2 members)
9. Algebraic ‎(10 members)
10. Analog Calculators ‎(31 members)
11. Andy Kinsman ‎(1 member)
12. Art and Drafting ‎(1 member)
13. Artillery ‎(4 members)
14. Astronomy ‎(3 members)
15. Automatic Adding Machine Co. ‎(1 member)
16. Barron's ‎(1 member)
17. Blundell ‎(2 members)
18. Bruning ‎(1 member)
19. Brunsviga ‎(1 member)
20. Bulgaria ‎(2 members)
21. C-Thru ‎(2 members)
22. Calculated Industries ‎(4 members)
23. Calculating Instruments -- General Notes ‎(1 member)
24. Caltech ‎(1 member)
25. Carbic ‎(2 members)
26. Carrow ‎(1 member)
27. Casio ‎(2 members)
28. Charvoz-Roos ‎(2 members)
29. China ‎(24 members)
30. Circular Rules ‎(12 members)
31. Commodore ‎(1 member)
32. Concise ‎(8 members)
33. Contina ‎(1 member)
34. Controller ‎(1 member)
35. Crossover ‎(3 members)
36. Cruver ‎(2 members)
37. Cylindrical Rules ‎(2 members)
38. Darmstadt ‎(4 members)
39. Datexx ‎(1 member)
40. Davis ‎(1 member)
41. Demonstration Models ‎(2 members)
42. Denmark ‎(1 member)
43. Dennert and Pape ‎(3 members)
44. Dietzgen ‎(4 members)
45. Diwa ‎(1 member)
46. Duplex ‎(48 members)
47. Electronic Calculator Accessories ‎(27 members)
48. Electronic Calculators ‎(77 members)
49. Elektronika ‎(6 members)
50. Equation Storage ‎(9 members)

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