Trying to scrape a large database hidden through dropdown menu

Describe the problem:
Hey all, i am trying to scrape the database on this link: Einstelldaten | BING Power Systems GmbH - however, i cant select the dropdown menu nor the single entries in the table. My question is, can this be done with ? And if yes, can someone point me into the right direction? Thanks a lot!
Url: Einstelldaten | BING Power Systems GmbH

@maxfree Hello, it seems that the dropdown menu is embedded within a cross-domain 'iframe' which source is the following: BING Internet Tools

Unfortunately, as this page is reloaded each time a new option is being clicked it will not be possible to navigate through it using an 'Element click' selector.