# Relationship history for MSHA mine 3606352

Current hierarchy: **Altmire Harold L Jr → Alt Inc → Iselin 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

- **operator_operates_mine:** A & C Coal Company Inc → Iselin Mine; 1977-03-01 to 1984-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Altmire Brothers Coal Company Inc → Iselin Mine; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Altmire Brothers Coal Company Inc → A & C Coal Company Inc; 1977-03-01 to 1984-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Alt Inc → Iselin Mine; 1984-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Altmire Harold L Jr → Iselin Mine; 1984-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Altmire Harold L Jr → Alt Inc; 1984-11-19 to current/open; source msha-controller-operator-history