# Relationship history for MSHA mine 1202001

Current hierarchy: **John O  Coffin → Fairfield Builders Supply Corp → Berry Pit**

- 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

- **controller_controls_mine:** John O  Coffin → Berry Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fairfield Builders Supply Corp → Berry Pit; 1987-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John O  Coffin → Fairfield Builders Supply Corp; 1987-06-01 to current/open; source msha-controller-operator-history