# Relationship history for MSHA mine 4404137

Current hierarchy: **Mullins Ronald G → Jeff Coal Company → No 1 Strip 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Leatherman Inc & The Iron Peddlers Inc → No 1 Strip Mine; 1974-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tar Heel Coal Company → No 1 Strip Mine; 1975-07-01 to 1978-07-04; source msha-controller-operator-history
- **controller_controls_operator:** Leatherman Inc & The Iron Peddlers Inc → Tar Heel Coal Company; 1975-07-01 to 1978-07-04; source msha-controller-operator-history
- **operator_operates_mine:** Jeff Coal Company → No 1 Strip Mine; 1978-07-05 to 1981-04-30; source msha-controller-operator-history
- **controller_controls_mine:** South Zack L → No 1 Strip Mine; 1978-07-05 to 1981-04-30; source msha-controller-operator-history
- **controller_controls_operator:** South Zack L → Jeff Coal Company; 1978-07-05 to 1981-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Jeff Coal Company → No 1 Strip Mine; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Ronald G → No 1 Strip Mine; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Ronald G → Jeff Coal Company; 1981-05-01 to current/open; source msha-controller-operator-history