# Relationship history for MSHA mine 1511607

Current hierarchy: **Joseph T  Bennett → Harlan Cumberland Coal Company → D-2 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:** Joseph T  Bennett  et al → D-2 Mine; 1974-08-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Cumberland Coal Company → D-2 Mine; 1978-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph T  Bennett  et al → Harlan Cumberland Coal Company; 1978-10-01 to current/open; source msha-controller-operator-history