Crystal radio receiver with vertical coil, written on bottom: "right ground / left ariel" [sic], and "lower down / ground [wire?] / higher up at / left is / ariel" [sic].

Marked: "Type 521 / Two Stage Amplifier / The Colin B. Kennedy Co. / San Francisco / Saint Louis"; on metal tag: "Serial No. L5038W6". A two-stage audio amplifier using two 301-A triodes with a ...

Crystal detector with adjustable cat's whisker, coil slider has 0-10 scale on plate. Terminals for ground, antenna and headphones. Reference: "Clymer-Greenwood" Maker: Howe Auto Products Co., Chicago, ...

Marked on box: "Manufactured by / American Mechanical Labs, Inc. / 285-7 N. Sixth Street / Brooklyn, N.Y. / U.S. Pat. Nos. 301710 - 414778 - 626741 - 655393 / and other patents pending." The device is ...

Creator: Pullman Palace Car Co.Pullman, George M., 1831-1897Names: Lincoln, Robert Todd ...