# Relationship history for MSHA mine 3002753

Current hierarchy: **Burrows Frederick R → Fred Burrows → Burrows Pit #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Fred Burrows → Burrows Pit #2; 1986-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burrows Frederick R → Burrows Pit #2; 1986-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burrows Frederick R → Fred Burrows; 1986-08-01 to current/open; source msha-controller-operator-history