# Relationship history for MSHA mine 4003015

Current hierarchy: **J Lee  Powell → Old Hickory Clay Company → Carroll County 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:** J Lee  Powell et al → Carroll County Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Old Hickory Clay Company → Carroll County Mine; 1989-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Lee  Powell et al → Old Hickory Clay Company; 1989-06-01 to current/open; source msha-controller-operator-history