| DATE | LOCATION | CITATION | TEXT INDEX ENTRY | 1773.11.11 | New York | CITATION | Heyer, Frederick, organ builder, also makes harpsichords, spinets | 1767.12.17 | New York | CITATION | Heyer, John Frederick, makes harpsichords and spinets, repairs organs | 1767.12.24 | New York | CITATION | Heyer, John Frederick, makes harpsichords and spinets, repairs organs | 1768.01.07 | New York | CITATION | Heyer, John Frederick, makes harpsichords and spinets, repairs organs | 1768.01.14 | New York | CITATION | Heyer, John Frederick, makes harpsichords and spinets, repairs organs |