TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: In Copyright - Rights-holder(s) Unlocatable or Unidentifiable TI - Beckman Model 821 regulators on pencil-drawn circuit diagram ID - b2773w01b AU - Armstrong & Hess DA - 1950/// YR - 1950 AV - Beckman Historical Collection, Box 85 VL - Beckman Historical Collection, Box 85 AN - Beckman Historical Collection, Box 85 UR - https://digital.sciencehistory.org/works/b2773w01b AB - This photograph is part of a series of marketing images used to demonstrate the small size of Helipot products, in this case voltage regulators. KW - Voltage regulators KW - Pencils KW - Beckman Instruments, Inc. LA - ER -