# Relationship history for MSHA mine 0504809

Current hierarchy: **Harold E  Clare → A-C Concrete & Materials → Twin Creek Campground**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** A-C Concrete & Materials → Twin Creek Campground; 2005-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold E  Clare → Twin Creek Campground; 2005-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Clare → A-C Concrete & Materials; 2005-03-01 to current/open; source msha-controller-operator-history