note that at 18:52 the lady has changed from facebow + lip bumper to two facebows
(18:56 - 19:59)
Nein, wir sehen hier zweimal den Oberkiefer. Einmal in echt, und einmal im Spiegel!
No, this is just one facebow. You can see the one an only facebow attached to the upper jaw two times. The one showed in the lower part of the picture ist the original one; the one showed in the upper part of the picture is an image within a mirror!