# Relationship history for MSHA mine 4201402

Current hierarchy: **Margaret  Abt → A U Mines Inc → A U Mines Inc Hiawatha**

- 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

- **operator_operates_mine:** Mt States Mining Company → A U Mines Inc Hiawatha; 1975-09-01 to 1978-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Kingston Eldon--Noel S Tanner & Dick E Bastian → A U Mines Inc Hiawatha; 1975-09-01 to 1978-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Kingston Eldon--Noel S Tanner & Dick E Bastian → Mt States Mining Company; 1975-09-01 to 1978-04-11; source msha-controller-operator-history
- **operator_operates_mine:** A U Mines Inc → A U Mines Inc Hiawatha; 1978-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peter  Abt → A U Mines Inc Hiawatha; 1978-04-12 to 2016-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Peter  Abt → A U Mines Inc; 1978-04-12 to 2016-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Margaret  Abt → A U Mines Inc Hiawatha; 2016-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margaret  Abt → A U Mines Inc; 2016-03-31 to current/open; source msha-controller-operator-history