Dual-beam Cathode-Ray Oscillograph, <a class="external text" href="https://en.wikipedia.org/wiki/DuMont_Laboratories">DuMont Laboratories</a>, Clifton, NJ, USA, Type 322-A, S/N 9883, for 115/230 Volt AC, with scale illumination around the knobs, ca. 1950s.
Exhibit in the National Electronics Museum, 1745 West Nursery Road, Linthicum, Maryland, USA. All items in this museum are unclassified. The museum permitted photography without restriction.
<a href="//commons.wikimedia.org/wiki/User:Daderot" title="User:Daderot">Daderot</a>
2014-07-21 14:28:37
<span class="int-own-work" lang="en">Own work</span>