I have a book the Longriffles of Pennsylvania. By Russell Harriger. About the gun makers in Jefferson, Clarion and Elk counties.
This book has a section on two pages on Louise (Haines) Gagen
Talks about Daniel Long who died on January 24 192 who was a gunsmith, who lost and eye and changed to making musical instruments. Was survived by his granddaughter Louise Haines Gagen who remembers him well. She is one of the grand ladies of Brookville. She talks about him in great detail.
there is acopy of his will that mentions Louise get a fair share of his estate.
Has pictures of Daniel and his tombstone.
I can email the pages to anyone who would like them. Copy's of his book can be found on the net in out of print.