How to prove that Four Seasons Shangdong Property is the first golden key butler service model?

The methods to prove that Four Seasons Shandong Property is the first golden key butler service model are as follows:

1. Official promotional materials: You can check the official promotional materials of Four Seasons Shangdong Property to find out whether it ever claimed to be the first service provider of Golden Key Butler service mode.

2. Media reports: You can refer to relevant media reports to find out whether there are reports that Four Seasons Shangdong Property is the first service provider of the Golden Key Butler service model.

3. Industry choice: You can refer to the relevant industry choices to see if you have chosen Four Seasons Shangdong Property as the first service provider of Golden Key Butler service model.