Dr. Alvin M. Lewis. Dates working in Lyle assumed from regular ads in the Lyle Tribune.
https://www.findagrave.com/memorial/20977575/alvin-m-lewis

1921-01-14 - Radiography. I am prepared to do both dental and surgical X-Ray work. Dr. A. M. Lewis
1924 - Radiography. I am prepared to do both dental and surgical X-Ray work. Dr. A. M. Lewis
1927-07-22 - Radiography. I am prepared to do both dental and surgical X-Ray work. Dr. A. M. Lewis
1932-04-08 - "Lyle School News" - Prior to the Easter vacation Dr. Lewis, retired, made examination of the teeth of practically all the pupils in the school, and made recommendations in all cases where it seemed necessary that the teeth should be taken care of...