K&E 1740/4012 Thacher's Slide Rules
Clark McCoy's Collection:
- 1740 Type I --- Serial number 572
- 4012 Type II --- Serial number 4330
Collection of pictures from eBay sales:
Type I Thacher
- 1740 Type I --- Serial number 692
- 1740 Type I --- Serial number 868
Type II Thacher
- 4012 Type II --- Serial Number 2552
- 4012 Type II --- Serial Number 2598
- 4012 Type II --- Serial Number 2891
- 4012 Type II --- Serial Number 3013
- 4012 Type II --- Serial Number 3743
- 4012 Type II --- Serial Number 4312
- 4012 Type II --- Serial Number 4944
- 4012 Type II --- Serial Number 5079
- 4012 Type II --- Serial Number 5095
- 4012 Type II --- Serial Number 5308
Type III Thacher
- 4012 Type III Specimen #1
- 4012 Type III Specimen #2
- 4012 Type III Specimen #3
- 4012 Type III Specimen #4