# Relationship history for MSHA mine 0202154

Current hierarchy: **W S Holding Corp → Western States Minerals Corp → Portland 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** S J Groves & Sons Company → Portland Mine; 1978-08-01 to 1990-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Jorinex Exploration → Portland Mine; 1983-06-01 to 1984-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Bardswich Joe → Portland Mine; 1983-06-01 to 1984-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Bardswich Joe → Jorinex Exploration; 1983-06-01 to 1984-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Western States Minerals Corp → Portland Mine; 1984-07-11 to 1990-01-07; source msha-controller-operator-history
- **controller_controls_operator:** S J Groves & Sons Company → Western States Minerals Corp; 1984-07-11 to 1990-01-07; source msha-controller-operator-history
- **controller_controls_mine:** W S Holding Corp → Portland Mine; 1989-07-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western States Minerals Corp → Portland Mine; 1990-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W S Holding Corp → Western States Minerals Corp; 1990-01-08 to current/open; source msha-controller-operator-history