Radio Systems, comprised of radio receivers and transmitters, Radio beacons machines and apparatus; Radio buoys; Radio relays; Masts for wireless aerials; Radio echo sounders; Spark-guards, namely, electrical gang boxes; Single-gang low-voltage box; Double-gang low-voltage box; Triple-gang box; Quad-gang box; Old-work (retrofit) gang box; New-work gang box; Surface-mount gang box; Flush-mount gang box; Metal gang box (EMI-shielded); Non-metallic (plastic) gang box; Weatherproof / outdoor gang...