# Relationship history for MSHA mine 1504557

Current hierarchy: **Hogg Jim → Lake Coal Company Inc → No 1 Surface 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

- **controller_controls_mine:** Hogg Jim → No 1 Surface Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Flint Creek Mng Co → No 1 Surface Mine; 1950-01-01 to 1973-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Flint Creek Mng Co → No 1 Surface Mine; 1950-01-01 to 1973-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Flint Creek Mng Co → Flint Creek Mng Co; 1950-01-01 to 1973-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Lake Coal Company Inc → No 1 Surface Mine; 1973-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hogg Jim → Lake Coal Company Inc; 1973-01-02 to current/open; source msha-controller-operator-history