# Relationship history for MSHA mine 1505196

Current hierarchy: **Hoskins Walter S → Big O Coal Company → No 1 Tipple**

- 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:** Indian Creek Coal Company → No 1 Tipple; 1950-01-01 to 1973-06-18; source msha-controller-operator-history
- **controller_controls_mine:** Indian Creek Coal Company → No 1 Tipple; 1950-01-01 to 1973-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Indian Creek Coal Company → Indian Creek Coal Company; 1950-01-01 to 1973-06-18; source msha-controller-operator-history
- **operator_operates_mine:** Big O Coal Company → No 1 Tipple; 1973-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hoskins Walter S → No 1 Tipple; 1973-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hoskins Walter S → Big O Coal Company; 1973-06-19 to current/open; source msha-controller-operator-history