細節
A Brownie Two-Stage Note Magnifier and crystal set
in complementary black moulded cases, the Note Magnifier with two valves, the No. 2 crystal set with loading coil and enclosed detector -- 11.7/8in. (30cm.) wide, circa 1926 (2)
in complementary black moulded cases, the Note Magnifier with two valves, the No. 2 crystal set with loading coil and enclosed detector -- 11.7/8in. (30cm.) wide, circa 1926 (2)