# Relationship history for MSHA mine 3502525

Current hierarchy: **Jeanne M  (Seubert) McDonough → Clearwater Concrete Inc → ONTARIO PIT & PLANT**

- 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:** Ontario Asphalt Paving Company → ONTARIO PIT & PLANT; 1950-01-01 to 1983-07-28; source msha-controller-operator-history
- **controller_controls_mine:** J C Compton Company → ONTARIO PIT & PLANT; 1950-01-01 to 1983-07-28; source msha-controller-operator-history
- **controller_controls_operator:** J C Compton Company → Ontario Asphalt Paving Company; 1950-01-01 to 1983-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Ontario Asphalt & Concrete Inc → ONTARIO PIT & PLANT; 1983-07-29 to 1996-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Merle  Maine → ONTARIO PIT & PLANT; 1983-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merle  Maine → Ontario Asphalt & Concrete Inc; 1983-07-29 to 1996-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Clearwater Concrete Inc → ONTARIO PIT & PLANT; 1996-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeanne M  (Seubert) McDonough et al → ONTARIO PIT & PLANT; 1996-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeanne M  (Seubert) McDonough et al → Clearwater Concrete Inc; 1996-05-30 to current/open; source msha-controller-operator-history