Gaylord NC-1357A Category : Gaylord I like this unit so much in part because there’s no branding on the front.
GE 521BXT Category : GEI think that this smoke detector might be intended for use in security systems.
Space Age A32-BL-SFXC-TJ24D-HA24D+HA24D Category : Space Age ElectronicsI’m pretty sure that the horn on this unit is made by Space Age Electronics. Otherwise, it’s probably a Wheelock...