A Google search for these guys only brought up the Internet Archive entry from which this file is sourced. The text there says:
Irish bagpipes, fiddle, flute, and cello. Beltona label. The lineup here is William Andrews, pipes, James Cawley, flute, and Frank O'Higgins, fiddle, backed by the cello (name unknown), which along with Andrews's chugging on his regulators gives a quite unique sound. Cawley and O'Higgins also recorded with piper James Ennis in the Fingal Trio, one recording of which is on this site. A 78 of Andrews is featured here as well. Andrews and Ennis both learned from the same old piper, Nicholas Markey, but developed somewhat different styles.
Old Ireland Quartette - The Star of Munster