. Electronic apparatus for biological research . Armature retaining / screw Residual stud Figure The 3000 type relay (JBy courtesy of J. Atkinson and Sir Isaac Pitman and Sons, Ltd., from Telephony, 194S)

---

Size: 2377px × 2102px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity