# Relationship history for MSHA mine 1516951

Current hierarchy: **Mullins Garmon B → Potter'S Fork Coal Company Inc → #1**

- 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:** Potter'S Fork Coal Company Inc → #1; 1990-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Garmon B Et Al → #1; 1990-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Garmon B Et Al → Potter'S Fork Coal Company Inc; 1990-09-01 to current/open; source msha-controller-operator-history