CG 6610-C* - Microphone in law offices

• This was a mite microphone installed behind the baseboard in an office in Room 705, 100 North La Salle Street, Chicago, IL per www.maryferrell.org/showDoc.html?docId=168561#relPageId=4
• Installed 1963-02-11 and placed in service 1963-02-12 per www.maryferrell.org/showDoc.html?docId=167899#relPageId=2&search=%22CG_6283%22
• One document at Mary Ferrell for the alphabetical version www.maryferrell.org/search.html?q=%22CG%20six%20six%20one%20zero%22&types=D
• Five documents at Mary Ferrell for the numeric version www.maryferrell.org/search.html?q=%22CG%206610%22&types=D