# Relationship history for MSHA mine 1512086

Current hierarchy: **Patriot Coal Corporation → Catenary Coal Company → D-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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Envirodyne Industries → D-7 Mine; 1977-08-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Benham Coal Inc → D-7 Mine; 1979-09-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Envirodyne Industries → Benham Coal Inc; 1979-09-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** International Harvester Company → D-7 Mine; 1980-03-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Benham Coal Inc → D-7 Mine; 1980-04-01 to 1989-08-06; source msha-controller-operator-history
- **controller_controls_operator:** International Harvester Company → Benham Coal Inc; 1980-04-01 to 1989-08-06; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → D-7 Mine; 1989-08-01 to 2005-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Catenary Coal Company → D-7 Mine; 1989-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Catenary Coal Company; 1989-08-07 to 2005-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Magnum Coal Company → D-7 Mine; 2005-12-31 to 2008-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Magnum Coal Company → Catenary Coal Company; 2005-12-31 to 2008-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Patriot Coal Corporation → D-7 Mine; 2008-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patriot Coal Corporation → Catenary Coal Company; 2008-07-23 to current/open; source msha-controller-operator-history