I worked there, at Veneman's that is. Nagoyas were the house brand acoustics and Bradleys the electrics, though the Bradley name showed up on some acoustic/electric product from Korea later 90s. As stated, Music Emporium was a pretty succesful mail order division pre MF. Also the metro DC area is highly transient, as people come from all over for government jobs and education and sometimes leave 4 years later. Both Bradley and Nagoya were succesor to the Kapa brand which was the previous Veneman house brand, mostly used on electrics assembled in MD and some import acoustics.
Kapa- name formed from Veneman family first initials
Bradley- street in Bethesda, MD near a former Veneman chain location and also home.
Nagoya- city in Japan known for various guitar and MI companies.
Jack Casady used to teach at a Veneman's.