# Relationship history for MSHA mine 4402335

Current hierarchy: **Doug  Dalton → Salem Stone Corp → Wythe Sand Co**

- 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:** Locher & Company Inc → Wythe Sand Co; 1950-01-01 to 1988-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Boward G  LocherJr → Wythe Sand Co; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boward G  LocherJr → Locher & Company Inc; 1950-01-01 to 1988-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Doug  Dalton → Wythe Sand Co; 1983-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adams Construction Company → Wythe Sand Co; 1983-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Adams Construction Company → Wythe Sand Co; 1988-01-25 to 1989-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Adams Construction Company → Adams Construction Company; 1988-01-25 to 1989-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Salem Stone Corp → Wythe Sand Co; 1989-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doug  Dalton → Salem Stone Corp; 1989-04-03 to current/open; source msha-controller-operator-history