STROMBERG-CARLSON

TELEPHONIC INSTRUMENTS AND APPARATUS [ AND FOR RADIO APPARATUS, PARTS, AND APPURTENANCES ] -NAMELY, TELEPHONIC RECEIVING AND TALKING INSTRUMENTS, SIGNALING AND SIGNAL-RECEIVING INSTRUMENTS, TELEPHONIC SWITCHBOARDS, TELEPHONIC CENTRAL-EXCHANGE APPARATUS, TELEPHONIC LINE APPARATUS [ , CIRCUIT-PROTECTING DEVICES, ASSEMBLED RADIO RECEIVING SETS, HEAD SETS, LOUD SPEAKERS, TRANSFORMERS, VACUUM TUBES, PLUGS, JACKS, AND ELECTRICAL CONDENSERS ]