# Relationship history for MSHA mine 1516329

Current hierarchy: **Johns Barry → Wilgar Land Company → No 4**

- 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:** Johns Barry Et Al → No 4; 1984-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williamson Terry → No 4; 1987-06-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rough Branch Mining Inc → No 4; 1988-03-01 to 1988-11-28; source msha-controller-operator-history
- **controller_controls_operator:** Williamson Terry → Rough Branch Mining Inc; 1988-03-01 to 1988-11-28; source msha-controller-operator-history
- **operator_operates_mine:** Wilgar Land Company → No 4; 1988-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johns Barry Et Al → Wilgar Land Company; 1988-11-29 to current/open; source msha-controller-operator-history