Permit on the 18th which based on the address is probably in the Fantasyland Expansion. One of this company's previous permits was for "Experience Development - DBO Show Control Hardware" at the Dumbo location so I am guessing that MER might be for Little Mermaid.
1310 Magic Kingdom Dr (Storybook Circus?) - Experience Development - MER Interactive Electronic Equipment
1310 Magic Kingdom Dr (Storybook Circus?) - Experience Development - MER Interactive Electronic Equipment