How did they hid the camera in this mirror shot in “The Best Years of Our Lives” (1946)

I watched this on the massive display screen for the primary time and this take blew my thoughts. I can’t work out how they hid the digital camera on this scene, it begins once they go within the women room. There are 5 digital camera actions switching between 3 mirrors multi functional take and I can’t work out how they hid the digital camera. My spouse thought it was doubles however the actor and the reflections blink on the identical time. This may be certainly one of my new favourite pictures. It’s actually good and delicate.