# Relationship history for MSHA mine 4403609

Current hierarchy: **Evergreen Industries Inc → Sycamore Company Inc → No 3 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Big C Energy Corp → No 3 Strip; 1950-01-01 to 1978-03-12; source msha-controller-operator-history
- **controller_controls_mine:** Elkins Charles C Et Al → No 3 Strip; 1950-01-01 to 1978-03-12; source msha-controller-operator-history
- **controller_controls_operator:** Elkins Charles C Et Al → Big C Energy Corp; 1950-01-01 to 1978-03-12; source msha-controller-operator-history
- **controller_controls_mine:** Evergreen Industries Inc → No 3 Strip; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sycamore Company Inc → No 3 Strip; 1978-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evergreen Industries Inc → Sycamore Company Inc; 1978-03-13 to current/open; source msha-controller-operator-history