# Relationship history for MSHA mine 2601816

Current hierarchy: **Morris William W → Minerals Unlimited Inc → Barite #1 & #2**

- 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:** Morris William W → Barite #1 & #2; 1982-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Minerals Unlimited Inc → Barite #1 & #2; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morris William W → Minerals Unlimited Inc; 1982-08-01 to current/open; source msha-controller-operator-history