appliance screws for sale, brand-new and used.

Here is a really cool "audible signal appliance" (known to most of us as an alarm or siren) that once served in a factory where it warned employees to get out in the event of a fire. The fixture consists of two parts: a main siren unit with wire leads, and a "audible signal appliance accessory" which you might refer to as a horn or megaphone -- it directs the sound.