Charles F. Biele and Sons did work with the Carnegie Institute, Carnegie Museum of Art in Pittsburgh from 1915 to 1933. There is correspondence about cases made for the Carnegie Museum of Art and one of their patrons, Henry Dupuy, a Pittsburgh industrialist.
The reference to the correspondence can be found in the Carnegie Institute - Museum of Art finding aid at the Smithsonian Archives of American Art. Box 31 Folder 82 Charles F. Biele and Sons Co., 1915, 1918, 1932-1933.
The full record of the correspondence is in this large file.
The individual documents are listed here:
1915-3-11_letter_from_carnegie_institute_to_biele.pdf
1915-3-12_letter_from_biele_to_carnegie_institute.pdf
1915-3-18_letter_from_carnegie_institute_to_biele.pdf
1915-3-22_letter_from_biele_to_carnegie_institute.pdf
1915-4-06_letter_from_carnegie_institute_to_biele.pdf
1915-4-07_letter_from_biele_to_carnegie_institute.pdf
1915-4-08_letter_from_carnegie_institute_to_biele.pdf
1915-4-09_letter_from_biele_to_carnegie_institute.pdf
1915-4-12_letter_from_carnegie_institute_to_biele.pdf
1918-9-26_letter_from_biele_to_carnegie_institute.pdf
1918-9-27_letter_from_carnegie_institute_to_biele.pdf
1918-10-30_letter_from_biele_to_carnegie_institute.pdf
1932-01-09_letter_from_carnegie_institute_to_biele.pdf​