| Name | Type | Photo | Match |
|---|---|---|---|
| Keuffel & Esser < 4071 > Duplex | slide rule | 4189 | |
| Keuffel & Esser < 4071 T > Duplex, with Trig Scale, L scale on back, not on edge, dated 1915 | slide rule | 4547 | |
| Keuffel & Esser < 4071 T > Duplex, with Trig Scales, dated 1909 | slide rule | 4196 | |
| Keuffel & Esser < 4087 > Duplex | slide rule | 4288 | |
| Keuffel & Esser < 4088 - 3 > Polyphase Duplex | slide rule | 4301 | |
| Keuffel & Esser < 4088 - 3 > Polyphase Duplex, dated 1913 | slide rule | 4300 | |
| Keuffel & Esser <4071 T> Duplex with Trig scales, L scale on back, not on edge, dated 1913 | slide rule | 4499 | |
| Keuffel & Esser <4071 T> Duplex with Trig scales, L scale on back, not on edge, dated 1914 | 4546 | ||
| Keuffel & Esser 1744 1/2 Duplex, dated 1899 | slide rule | 4022 | |
| Keuffel & Esser 1744 A Duplex with trigonometrical slide, dated 1895 | 4682 |
| Name | Type | Photo | Match |
|---|---|---|---|
| Keuffel & Esser 1744 B Duplex with interchangeable slides both arithmetical and trigonometrical, dated 1895 | 4021 | ||
| Keuffel & Esser 1744 B Duplex with interchangeable slides both arithmetical and trigonometrical, dated 1897, 1899 | slide rule | 4587 | |
| Keuffel & Esser 1744 Duplex with arithmetical slide, dated 1895, Cox's Patent | slide rule | 4020 | |
| Keuffel & Esser 1744 Duplex with arithmetical slide, dated 1897 | slide rule | 4586 | |
| Keuffel & Esser 1744 Duplex with arithmetical slide, dated 1899 | slide rule | 4640 | |
| Keuffel & Esser 4060 Cox's Patent | slide rule | 5804 | |
| Keuffel & Esser 4060 Cox's Patent Variant | slide rule | 5806 | |
| Keuffel & Esser 4061 Duplex | 4166 | ||
| Keuffel & Esser 4061 Duplex | 4167 | ||
| Keuffel & Esser 4061 T Duplex, with Trig Scales | 4168 |
| Name | Type | Photo | Match |
|---|---|---|---|
| Keuffel & Esser 4061 T Duplex, with Trig Scales | 4169 | ||
| Keuffel & Esser 4065 Duplex | 4172 | ||
| Keuffel & Esser 4065 Duplex | 4173 | ||
| Keuffel & Esser 4065 T Duplex Trig | slide rule | 4174 | |
| Keuffel & Esser 4070 | slide rule | 4182 | |
| Keuffel & Esser 4070 Duplex | slide rule | 4183 | |
| Keuffel & Esser 4070 Duplex | slide rule | 4183 | |
| Keuffel & Esser 4071 Duplex | 4188 | ||
| Keuffel & Esser 4071 T Duplex, with Trig Scales, dated 1915 | 4197 | ||
| Keuffel & Esser 4083 Duplex | 4263 |
| Name | Type | Photo | Match |
|---|---|---|---|
| Keuffel & Esser 4083 Duplex | 4264 | ||
| Keuffel & Esser 4083 Duplex | 4265 | ||
| Keuffel & Esser 4083 T Duplex, with Trig Scales | 4283 | ||
| Keuffel & Esser 4083 T Duplex, with Trig Scales | 4284 | ||
| Keuffel & Esser 4086 Duplex | 4287 | ||
| Keuffel & Esser 4087 Duplex | 4290 | ||
| Keuffel & Esser 4087 Duplex | slide rule | 4289 | |
| Keuffel & Esser 4087 T Duplex, with Trig Scales | 4291 | ||
| Keuffel & Esser 4087 T Duplex, with Trig Scales | 4292 | ||
| Keuffel & Esser 4088 - 1S Polyphase Duplex | slide rule | 4296 |
| Name | Type | Photo | Match |
|---|---|---|---|
| Keuffel & Esser 4088 - 1S Polyphase Duplex | 4298 | ||
| Keuffel & Esser 4088 - 2 Polyphase Duplex | 4294 | ||
| Keuffel & Esser 4088 - 2 Polyphase Duplex | 4295 | ||
| Keuffel & Esser 4088 - 2S Polyphase Duplex | 4297 | ||
| Keuffel & Esser 4088 - 2S Polyphase Duplex | 4299 | ||
| Keuffel & Esser 4088 - 3 Polyphase Duplex | 4302 | ||
| Keuffel & Esser 4088 - 3S Polyphase Duplex | 4303 | ||
| Keuffel & Esser 4088 - 3S Polyphase Duplex | 4305 | ||
| Keuffel & Esser 4088 - 5 Polyphase Duplex | 4306 | ||
| Keuffel & Esser 4088 - 5 Polyphase Duplex | 4307 |
| Name | Type | Photo | Match |
|---|---|---|---|
| Keuffel & Esser 4088 - 5S Polyphase Duplex | 4308 | ||
| Keuffel & Esser 4090 Original prototype for 4090 Universal rule Variant | slide rule | 4622 | |
| Keuffel & Esser 4090 Original prototype for 4090 Universal rule, dated 1899 | slide rule | 4621 | |
| Keuffel & Esser 4090 Universal, 2 attached slides, dated 1901?, 1903? | slide rule | 4313 | |
| Keuffel & Esser 4092 Log Log Duplex | 4323 | ||
| Keuffel & Esser 4092 Log Log Duplex | 4324 | ||
| Keuffel & Esser 4092 Log Log Duplex | 4325 | ||
| Keuffel & Esser 4095 - 1S Merchants' Adjustable Duplex | 4347 | ||
| Keuffel & Esser 4095 - 1S Merchants' Adjustable Duplex | 4348 | ||
| Keuffel & Esser 4095 - 3 Merchants' Adjustable Duplex | 4358 |
| Name | Type | Photo | Match |
|---|---|---|---|
| Keuffel & Esser 4095 - 3 Merchants' Adjustable Duplex | slide rule | 4355 | |
| Keuffel & Esser 4095 - 3S Merchants' Adjustable Duplex | 4356 | ||
| Keuffel & Esser 4095 - 3S Merchants' Adjustable Duplex | 4357 | ||
| Keuffel & Esser 4095 - 3S Merchants' Adjustable Duplex | 4359 | ||
| Keuffel & Esser 4095 - 5 Merchants' Adjustable Duplex | 4360 | ||
| Keuffel & Esser 4095 - 5S Merchants' Adjustable Duplex | 4361 | ||
| Keuffel & Esser 4095 Merchants' Adjustable Duplex | 4354 | ||
| Keuffel & Esser 4095 Triangular Metal | slide rule | 4346 | |
| Keuffel & Esser 4160 Chemist's Duplex | 4446 | ||
| Keuffel & Esser 4160 Chemist's Duplex | 4448 |
| Name | Type | Photo | Match |
|---|---|---|---|
| Keuffel & Esser 4160 S Chemist's Duplex | 4447 | ||
| Keuffel & Esser 4160 S Chemist's Duplex | 4449 | ||
| Keuffel & Esser 4181 - 1 Pocket Slide Rule (A2. and ???) | slide rule | 4736 | |
| Keuffel & Esser N 4088 - 5 Polyphase Duplex | 4309 | ||
| Keuffel & Esser N 4088 - 5S Polyphase Duplex | 4310 | ||
| Nomo Type 0 | disc(s) | 3243 | |
| Post 1435 Eureka Mannheim | 3702 | ||
| Post 1436 Eureka Mannheim | 3703 | ||
| Post 1458 Universal Duplex | 3777 | ||
| Relay 650 CK-3 | slide rule | 2257 |
| Name | Type | Photo | Match |
|---|---|---|---|
| Sun Hemmi | slide rule | 2403 | |
| Sun Hemmi 150 | slide rule | 5675 | |
| Sun Hemmi 34 | Slide Rule | 7029 |