December 31

1930: Mueller Potter Drug Company forms a corporation and registers with the state of Wisconsin.
1940: "The last day of the year is a fairly busy one.  Mr. F.W. Mueller has a birthday.  He is 67.  We ahve company tonite to help see out the old year and welcome in the new.  Joe and Anna Weisheipl, Ed and Thres Fretschel are with us.  This is the first time out for Anna since she's been laid up with game leg over a week ago. Laurence and Dolores Kinateder stay overnite with Donald and Mary Ann (son and daughter)."[from A. E. Potter's diaries]
1943: "F. W. Mueller is 70 years old today.  He is feeling quite well.  Another lovely day, temperatures up to 34.  Worked until 9:30.  Ed and Thres Fretschel, Annie Heip, Aunt Lena Baier are over to see the year out.  Party breaks up at 3:15 A.M. and I chauffeur the folks home.  Received a card fomr Lt. Charles F. Nolan today.  He is somewhere in the Pacific.  The card was on the way for 20 days.  Dolores and Alois Kinateder are overnight guest at our house." [from A. E. Potter's diaries]