This is a list of different fixtures that have been made by Elevator Research & Manufacturing (also known as ERM). Note that these names only refer to the buttons. Some of these buttons are actually Dewhurst buttons that are sold under the ERM name, due to ERM being a division of Dewhurst plc.
This button looks very similar to an Epco WNR Signature button. This button was discontinued.
This button looks similar to an Otis Series 2-6 button. This button was discontinued.
This is a round white plastic illuminating button with a black ring around the outside which looks similar to GAL Jet Plus and Epco WS Haloline. This button may have older and newer versions where the older version protrudes out from the panel more and presses further in than the newer version.
This button looks similar to Unknown 1, but the button is smaller. This was likely one of the first models of ERM buttons. This button was discontinued.
This is a round metal button, with a flat surface. It is unknown if a brass version was made in the past. The current version has a light in the middle of the button. Previous versions have a halo around the button that lights up.
This is a Dewhurst US91BB button sold under the Elevator Research & Manufacturing name. There is the 20TT-A, with a silver ring, and a gold center, 20TT-B, with an all silver button, 20TT-C, with a gold ring, and a silver center, and the 20TT-D, with an all gold button.
This is a square metal button, There is the CA-90SS (stainless steel), and the CA-90B (brass). Previously, only the CA-90 (stainless steel) was made.
This is a round metal button, with a mushroom shaped surface. There is the CA-91SS (stainless steel), and the CA-91B (brass). Previously, only the CA-91 (stainless steel) was made.
This button looks very similar to an Adams Survivor button. There is also the CA-92I, which is the same button, with a braille around the button. This is a Dewhurst US92 button sold under the Elevator Research & Manufacturing name. There is an older and newer version of this button. The difference is that the older version protrudes from the panel more, and presses in more.
This is the vandal resistant button. Older CA-93 buttons look very similar to a Schindler HT or MT Vandal Resistant button. In 2004-2008, these fixtures were redesigned. Now, CA-93 buttons have 3 lights, sort of like a recycle symbol.
This button looks very similar to an Adams Designer button. There is also the CA-94I, which is the same button, with a braille around the button. There is also a white ring around the button for newer CA-94I buttons. This is a Dewhurst US92 button sold under the Elevator Research & Manufacturing name. Like CA-92 fixtures, there is probably 2 versions, with the older one protruding from the panel more, and pressing in more, but this is unconfirmed.
This is a Dewhurst US91 button sold under the Elevator Research & Manufacturing name.
Lanterns/Key Switches/Fire Service Buttons & Lights/Indicators
There are no known model numbers for lanterns/key switches/fire service buttons & lights/indicators.