# Relationship history for MSHA mine 3604784

Current hierarchy: **Stoker Irvan → Glen Irvan Corp → Sherman Strip**

- 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:** Stoker Irvan → Sherman Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jack Phillips Coal Co → Sherman Strip; 1973-08-24 to 1975-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Phillips Jack Coal Company → Sherman Strip; 1973-08-24 to 1975-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Phillips Jack Coal Company → Jack Phillips Coal Co; 1973-08-24 to 1975-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Glen Irvan Corp → Sherman Strip; 1975-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stoker Irvan → Glen Irvan Corp; 1975-07-01 to current/open; source msha-controller-operator-history