# Relationship history for MSHA mine 4606245

Current hierarchy: **Sidusco Inc → Leckie Smokeless Coal Company → Number 4 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:** I C M Carbomin International Corp → Number 4 Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Leckie Smokeless Coal Company → Number 4 Strip; 1980-10-01 to 1981-10-05; source msha-controller-operator-history
- **controller_controls_operator:** I C M Carbomin International Corp → Leckie Smokeless Coal Company; 1980-10-01 to 1981-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Sidusco Inc → Number 4 Strip; 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Leckie Smokeless Coal Company → Number 4 Strip; 1981-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sidusco Inc → Leckie Smokeless Coal Company; 1981-10-06 to current/open; source msha-controller-operator-history