Title
The Ballantine Rule... DB <--> ratio conversionCatalog Number
102793028Type
Physical ObjectDescription
The object has an internal sliding scale. One side is labeled "DB <--> RATIO CONVERSION." The other side labeled "VOLTS <--> DB POWER LEVEL."Date
Circa 1953Manufacturer
Ballantine Laboratories, Inc.Dimensions
overall: 1/8 in x 8 1/2 in x 3 inCredit
Gift of Christopher GarciaLot Number
X9149.2020
