# Relationship history for MSHA mine 4605394

Current hierarchy: **Valley Industries Inc → S S Joe Burford Inc → Hickory Lick No 4a 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Mc Rae C C → Hickory Lick No 4a Mine; 1976-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Gem Coal Company → Hickory Lick No 4a Mine; 1976-12-01 to 1978-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Mc Rae C C → Black Gem Coal Company; 1976-12-01 to 1978-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Valley Industries Inc → Hickory Lick No 4a Mine; 1976-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S S Joe Burford Inc → Hickory Lick No 4a Mine; 1978-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Valley Industries Inc → S S Joe Burford Inc; 1978-03-08 to current/open; source msha-controller-operator-history