# Relationship history for MSHA mine 1517284

Current hierarchy: **Gary D  Fields → Topper Coal Company Inc → No 7 Mine**

- 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

- **controller_controls_mine:** Gary D  Fields → No 7 Mine; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis Allen  Ramey → No 7 Mine; 1987-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** United Fuels Inc → No 7 Mine; 1992-07-01 to 1993-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Dennis Allen  Ramey → United Fuels Inc; 1992-07-01 to 1993-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Topper Coal Company Inc → No 7 Mine; 1993-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary D  Fields → Topper Coal Company Inc; 1993-04-07 to current/open; source msha-controller-operator-history