# Relationship history for MSHA mine 1509500

Current hierarchy: **Williams Companies Inc → Williams Holdings Of Delaware Inc → No 2 Plant**

- 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:** Kaneb Services Inc → No 2 Plant; 1972-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Coal Company Inc → No 2 Plant; 1976-01-22 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Kaneb Services Inc → Interstate Coal Company Inc; 1976-01-22 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Williams Holdings Of Delaware Inc → No 2 Plant; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williams Companies Inc → No 2 Plant; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Companies Inc → Williams Holdings Of Delaware Inc; 1985-07-01 to current/open; source msha-controller-operator-history