# Relationship history for MSHA mine 1512943

Current hierarchy: **Wilson Robert → C C A Ventures Inc → No 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:** American Viking Inc → No 1; 1981-06-01 to 1982-01-17; source msha-controller-operator-history
- **controller_controls_mine:** American Viking Contractors Inc → No 1; 1981-06-01 to 1982-01-17; source msha-controller-operator-history
- **controller_controls_operator:** American Viking Contractors Inc → American Viking Inc; 1981-06-01 to 1982-01-17; source msha-controller-operator-history
- **operator_operates_mine:** Big M Mining Company Inc → No 1; 1982-01-18 to 1983-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Cooke William C → No 1; 1982-01-18 to 1983-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Cooke William C → Big M Mining Company Inc; 1982-01-18 to 1983-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Tri-Circle Energy → No 1; 1983-01-26 to 1983-10-05; source msha-controller-operator-history
- **controller_controls_mine:** King Thomas → No 1; 1983-01-26 to 1983-10-05; source msha-controller-operator-history
- **controller_controls_operator:** King Thomas → Tri-Circle Energy; 1983-01-26 to 1983-10-05; source msha-controller-operator-history
- **operator_operates_mine:** Geneva Mining Inc → No 1; 1983-10-06 to 1983-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Thompson Ralph → No 1; 1983-10-06 to 1983-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Ralph → Geneva Mining Inc; 1983-10-06 to 1983-10-12; source msha-controller-operator-history
- **operator_operates_mine:** C C A Ventures Inc → No 1; 1983-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Robert → No 1; 1983-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Robert → C C A Ventures Inc; 1983-10-13 to current/open; source msha-controller-operator-history