Historical clue formulations

• OB/___ (med. specialty) — 2024-09-16
• OB/___ — 2022-07-12
• OB/___ — 2019-03-06
• Ob-___ — 2016-03-01
• Ob-___ — 2015-02-08
• Ob-___ — 2012-08-14
• Ob-___ (med. specialty) — 2010-06-07
• Med. specialty — 2006-01-13
• Ob-___ — 2006-01-11
• Med. specialty — 2005-05-01
• Ob-___ — 2003-01-12
• OB/___ (certain doctor) — 1998-05-05
• Med. specialty — 1997-02-16
• Ob-_____ (medical specialist) — 1995-09-03