# Relationship history for MSHA mine 3609968

Current hierarchy: **Bill T  Johnson → Stevensville Stone Supply LLC → Alderson Quarry**

- 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

- **controller_controls_mine:** Alan C  Gage → Alderson Quarry; 1987-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alan C. Gage → Alderson Quarry; 2011-10-31 to 2026-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Alan C  Gage → Alan C. Gage; 2011-10-31 to 2026-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Bill T  Johnson → Alderson Quarry; 2018-10-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stevensville Stone Supply LLC → Alderson Quarry; 2026-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill T  Johnson → Stevensville Stone Supply LLC; 2026-06-08 to current/open; source msha-controller-operator-history