# Relationship history for MSHA mine 0101685

Current hierarchy: **Nutter James E → Buckeye Coal Company → Clayton No 1 Strip**

- 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:** Helfrich George → Clayton No 1 Strip; 1976-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Century Mine Management Company Inc → Clayton No 1 Strip; 1977-03-01 to 1978-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Helfrich George → Century Mine Management Company Inc; 1977-03-01 to 1978-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Buckeye Coal Company → Clayton No 1 Strip; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nutter James E → Clayton No 1 Strip; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nutter James E → Buckeye Coal Company; 1978-05-01 to current/open; source msha-controller-operator-history