# Relationship history for MSHA mine 3606818

Current hierarchy: **AOI Coal Company → Kittanning Coal Company Inc → Kittanning Coal**

- 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:** De Motto James → Kittanning Coal; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kittanning Coal Company → Kittanning Coal; 1979-04-01 to 1987-03-15; source msha-controller-operator-history
- **controller_controls_operator:** De Motto James → Kittanning Coal Company; 1979-04-01 to 1987-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Kittanning Coal Company Inc → Kittanning Coal; 1987-03-16 to 1988-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Liperote John Et Al → Kittanning Coal; 1987-03-16 to 1988-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Liperote John Et Al → Kittanning Coal Company Inc; 1987-03-16 to 1988-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Kittanning Coal Company Inc → Kittanning Coal; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** AOI Coal Company → Kittanning Coal; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** AOI Coal Company → Kittanning Coal Company Inc; 1988-10-01 to current/open; source msha-controller-operator-history