Six more photos. Can I identify these men?

This photograph is from the Douglas studio of Evansville, Indiana. On the back in pencil is "Jake Lemmon." Evansville is in Vandenburgh County. Unfortunately, no good candidate for this man could be identified in census records.

Jake Lemmon.

A photograph taken at the Prescher studio at the corner of 6th and Chestnut Streets in Milwaukee, Wisconsin. On the back in pen is "Papa's father, and brother to Hy Schloemer's wife Margaret. Hy. Schloemer Sr & Margaret Schloemer, his wife, are Alma's [or Oma's?] father & mother. 1883." I failed to find any person named Hy Schloemer. I eventually searched  on Ancestry Family Tree for a person named Marg* married to a Schloemer. On the 1880 census was Henry Schloemer and his wife Margarethe. They had four children- Mary, Caroline, Phillip, and Henry. On Findagrave the couple is listed as being buried in the Union Cemetery in West Bend, Washington County, Wisconsin as Margaretha  (Mueller) Schloemer (1846-1888) and Henry Schloemer (1837-1908). 

So the mystery man is Margaretha's brother and his last name is likely Mueller. 

Mr. Mueller.

A photograph from the A. P. Frans studio at 522 Tower Avenue, West Superior, Wisconsin. On the back in ink is "Adolf Wisterberg 1897." West Superior is in Douglas County. I was unable to find the man in the census.

Adolf Wistenberg.

A photograph from the C. A. Carlson studio at 1509 Fifth Street in West Superior, Wisconsin. m On the back in pen is "Theodre Swanson 1897." This was originally almost certainly in the same album as the previous photo. I could not find this man in census records.

Theodore Swanson.

A photograph from the Roberts & Brooks Photographic Art Studio of Cleveland, Ohio. This was located at 130 Ontario Street. In pencil is the name "Robert Irving."

There were more than one men named Robert Irving in Ohio. One was listed on the census in 1930 in Cuyahoga, much later than when the photo was taken. The man remains unidentified.
 

Robert Irving.

A photograph from the A. M. Laub studio of Columbus, Wisconsin. On the back in pen is "Uncle Leo Winter Grandma's brother." At last I was able to identify one of the men. 

The 1900 census lists Leo  August Winter with his widowed mother Caroline Winter (his father Mathias Winter died in 1887) and sister Lizzie Stark on Ludington Street in Columbus, Columbia County, Wisconsin. He was working as a salesman in a hardware store. He was born on 28 December 1877 in Columbus. He died in 1942 and is buried in Hillside Cemetery in Columbus. 

Leo August Winter.