Siemens AG purchased both Cerberus Pyrotronics and Faraday in 1996-1997 to form the Siemens Life Safety branch. This predates the EST3 by around 5-7 years.As for Landis & Gyr, one of the larger hospitals in my state (High Point Regional Medical Center) has a HUGE Honeywell system (EST3) with Landis & Gyr rebadged EST SIGA-278 and FCI MS-2 pulls and Siemens-branded EST SIGA detectors. Signals are EST Integrity and Genesis lines, all voice evac. For the record, the now-defunct FAST (which became EST) used rebadged FCI pulls and devices before Edwards arrived on the scene.
According to Wikipedia, Siemens AG bought Landis & Gyr in the late 1990s and sold them in 2004. My guess is that since Landis & Gyr had been rebranding FAST and EST equipment since before the Siemens buyout, Siemens AG just allowed them to continue using EST devices under the Siemens badge for backwards compatibility purposes. As we know, Siemens/Pyrotronics addressable equipment is in NO WAY compatible with EST.
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The EST 3 came out in July 1996.