Image: US Patent 2424267 Figs 1a, 1b, 1c

Description: figure 1a, 1b and 1c from US patent 2424267, Philip S. Carter, "High frequency resonator and circuits therefor", granted 1947-07-22 , assigned to Radio Corporation of America 
Title: US Patent 2424267 Figs 1a, 1b, 1c
Credit: From patent document.
Author: Philip S. Carter
Permission: The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted.See [1], 37 CFR 1.7(d), 37 CFR 1.84(s) The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No