Here is the information I have of the Grinnel bros. piano:

"Manufactured by the well-known house of the same name Detroit Mich A very
large proportion if the pianos made by them are sold at retail through their
Detroit store &the forty branch stores of the house located in Mich,Oh, &
ontario. the Grinnel Bros piano is artistic in the highest sence of the term.
It is made with the utmost care by skilled workman in their large modern,
perfectly equipped factories. The Grinnel Bros.is purchased largely by
musicians & musical people who express for it a preference over all other
makes & it is the pride of the manufacturers that all material & workmanship
is the best that money can buy.

The main headquarters of Grinnel Bros is at Detroit' their largest factory is
at holly, Mich. The standing of the house is of the very highest Incorporated
with a capital stock of $5,000,000.