# Relationship history for MSHA mine 2901770

Current hierarchy: **George  Lotspeich → Hydro Resource → Chance**

- 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:** Great Republic Venture Ltd → Chance; 1979-01-01 to 1982-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Ingraham Floyd Et Al → Chance; 1979-01-01 to 1982-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Ingraham Floyd Et Al → Great Republic Venture Ltd; 1979-01-01 to 1982-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Van Zyl Bernard → Chance; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Resources America Inc → Chance; 1982-02-12 to 1989-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Van Zyl Bernard → Resources America Inc; 1982-02-12 to 1989-05-02; source msha-controller-operator-history
- **operator_operates_mine:** Hydro Resource → Chance; 1989-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George  Lotspeich → Chance; 1989-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Lotspeich → Hydro Resource; 1989-05-03 to current/open; source msha-controller-operator-history