K&E 1740/4012 Thacher's Slide Rules
Clark McCoy's Collection:
- 4012 Type II --- Serial number 4330
Collection of pictures from eBay sales:
Type I Thacher
- 1740 Type I --- Serial number 692
Type II Thacher
- 4012 Specimen #1
- 4012 Specimen #2
- 4012 Specimen #3 --- Serial Number 4312
- 4012 Specimen #4 --- Serial Number 2552
- 4012 Specimen #5 --- Serial Number 5308
- 4012 Specimen #6 --- Serial Number 5095
- 4012 Specimen #7 --- Serial Number 2598
- 4012 Specimen #8 --- Serial Number 4944
- 4012 Specimen #9 --- Serial Number 5079
- 4012 Specimen #10 -- Serial Number 3013
- 4012 Specimen #11 -- Serial Number 2891
- 4012 Specimen #12 -- Serial Number 3743
Type III Thacher