This pinball technician is probably from Switzerland, and since he is working abroad in California, USA, he likes to demonstrate his patriotism by wearing a t-shirt emblazoned with the Swiss Cross:
![](https://blog.psy-q.ch/whythatswissflag/wp-content/uploads/sites/6/2020/05/1540400866_20181020_135118-1024x768.jpg)
That way visitors know that if they want the best technician, they should call the Swiss technician.