# Relationship history for MSHA mine 1511284

Current hierarchy: **Lemar Reece → Harlan-Bell Coal Inc → Smith No 4 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:** Bow Valley Industries Ltd → Smith No 4 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bow Valley Coal Resources Inc → Smith No 4 Mine; 1978-06-01 to 1979-07-02; source msha-controller-operator-history
- **controller_controls_operator:** Bow Valley Industries Ltd → Bow Valley Coal Resources Inc; 1978-06-01 to 1979-07-02; source msha-controller-operator-history
- **operator_operates_mine:** Harlan-Bell Coal Inc → Smith No 4 Mine; 1979-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lemar Reece → Smith No 4 Mine; 1979-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lemar Reece → Harlan-Bell Coal Inc; 1979-07-03 to current/open; source msha-controller-operator-history