Seeking name credits for pulp SF artists

Question

I'm trying to identify a few artists whose work appeared in SF pulps currently in the public domain, but whose name credits did not appear in the original issue. I have their signatures but not their full names. I wonder if anyone here might know...?

The artists I'm trying to identify are:

DIEHL - illo for "Bolden's Pets" by Floyd L. Wallace, appeared in Galaxy Science Fiction, October, 1955

Kramer - illo for "The Repairman" by Harry Harrison, appeared in Galaxy, February 1958

Rogers - illo for "Temple Trouble" by H. Beam Piper, appeared in Astounding Science Fiction, April, 1951. I suspect this may be Hubert Rogers.

Answer 1

DIEHL - illo for "Bolden's Pets" by Floyd L. Wallace, appeared in Galaxy Science Fiction, October, 1955 [available at the Internet Archive].

The ISFDB does not know his full name; it lists some of his other works.

Kramer - illo for "The Repairman" by Harry Harrison, appeared in Galaxy, February 1958 [available at the Internet Archive].

Frank George Kramer, 1905–1993; see ISFDB, Wikipedia, Pulp Artists.

Rogers - a bunch of illoes for "Temple Trouble" by H. Beam Piper, appeared in Astounding Science Fiction, April, 1951 [available at the Internet Archive]. I suspect this may be Hubert Rogers.

Reginald Hubert Rogers, 1898-1982; see ISFDB, Pulp Artists, The Encyclopedia of Science Fiction, SciFiGuy.ca.