# Relationship history for MSHA mine 1502009

Current hierarchy: **R K  Williams; Wilma F  Patrick → Processing Systems Llc → Loadout Systems**

- 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:** United States Steel Mining Company Inc → Loadout Systems; 1950-01-01 to 1984-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Usx Corp → Loadout Systems; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Usx Corp → United States Steel Mining Company Inc; 1950-01-01 to 1984-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Arch Of Kentucky → Loadout Systems; 1984-10-01 to 1999-05-26; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → Loadout Systems; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Arch Of Kentucky; 1984-10-01 to 1999-05-26; source msha-controller-operator-history
- **operator_operates_mine:** Processing Systems Llc → Loadout Systems; 1999-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilma F  Patrick et al → Loadout Systems; 1999-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilma F  Patrick et al → Processing Systems Llc; 1999-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R K  Williams et al → Processing Systems Llc; 1999-05-27 to current/open; source msha-controller-operator-history