# Relationship history for MSHA mine 0202197

Current hierarchy: **Smith J D → White Mountain Gypsum Inc → White Mountain #1**

- 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

- **operator_operates_mine:** South West Minerals Inc → White Mountain #1; 1984-03-01 to 1985-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Willsie Kurt → White Mountain #1; 1984-03-01 to 1985-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Willsie Kurt → South West Minerals Inc; 1984-03-01 to 1985-04-07; source msha-controller-operator-history
- **operator_operates_mine:** White Mountain Gypsum Inc → White Mountain #1; 1985-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith J D → White Mountain #1; 1985-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith J D → White Mountain Gypsum Inc; 1985-04-08 to current/open; source msha-controller-operator-history