# Relationship history for MSHA mine 3605586

Current hierarchy: **Swistock James W → Swistock Associates Coal Corp → Blair County**

- 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:** Jones Evan L → Blair County; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ace Drilling Coal Company Inc → Blair County; 1974-11-01 to 1984-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Jones Evan L → Ace Drilling Coal Company Inc; 1974-11-01 to 1984-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Swistock James W → Blair County; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Swistock Associates Coal Corp → Blair County; 1984-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Swistock James W → Swistock Associates Coal Corp; 1984-01-25 to current/open; source msha-controller-operator-history