Scope and Content From the Collection: This pistonphone is housed inside of a wooden box with two metal buckle closures. Labels between the buckles read "V.P.I. RESEARCH DIVISION 0400" and "BRUEL & kJAER." There are two additional labels on the back of the box that read "B & K INSTRUMENTS, INC. 5111 EST 164 STREET CLEVELAND, OHIO 44142 (216)267-4800" and "BRUEL & KRAJER TYPE 4220 SERIAL 210273." Stamped on the back of the box below these labels is "Made in Denmark." Inside the wooden box is a black velvet lining with...