细节
A Gamage's crystal set,
with enclosed detector and condenser and six-stud switch in mahogany case, circa 1921, a Brown H1 speaker base with a papier-mâché straight neck horn and a pair of Ericsson headphones (3)
with enclosed detector and condenser and six-stud switch in mahogany case, circa 1921, a Brown H1 speaker base with a papier-mâché straight neck horn and a pair of Ericsson headphones (3)