⌂
⚲
?
✕︎
clip:3053
clip:3053
clip:3053
clip:3053
clip:3053
clip:3053
clip:3053
clip:3053
clip:3053
hi
{"x":0,"y":0} to {"x":0,"y":0}
Copyright © details on Wikimedia Commons.
K41 Klystron reflective vacuum tube 01.jpg
▦