# Relationship history for MSHA mine 3502995

Current hierarchy: **Leamon Donald M → Karban Rock Inc → Karban Gales Creek Pit**

- 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:** Gary  Vanaken et al → Karban Gales Creek Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vanaken Rock Products Inc → Karban Gales Creek Pit; 1980-03-01 to 1981-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Vanaken et al → Vanaken Rock Products Inc; 1980-03-01 to 1981-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Vanaken et al → Vanaken Rock Products Inc; 1980-03-01 to 1981-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Karban Rock Inc → Karban Gales Creek Pit; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leamon Donald M Et Al → Karban Gales Creek Pit; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leamon Donald M Et Al → Karban Rock Inc; 1981-09-01 to current/open; source msha-controller-operator-history