# Relationship history for MSHA mine 4405649

Current hierarchy: **Davis Jerry M → Crockett Coal Company Inc → 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:** Davis Jerry M Et Al → No 4 Mine; 1980-08-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crockett Coal Company Inc → No 4 Mine; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Jerry M Et Al → Crockett Coal Company Inc; 1981-05-01 to current/open; source msha-controller-operator-history