# Relationship history for MSHA mine 2300709

Current hierarchy: **James  Burnham → Hardrock Quarries-Milburn Of St Joseph → Chillicothe Sand**

- 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:** Midwest Concrete & Asphalt Company → Chillicothe Sand; 1950-01-01 to 1979-06-05; source msha-controller-operator-history
- **controller_controls_mine:** Midwest Concrete & Asphalt Company → Chillicothe Sand; 1950-01-01 to 1979-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Midwest Concrete & Asphalt Company → Midwest Concrete & Asphalt Company; 1950-01-01 to 1979-06-05; source msha-controller-operator-history
- **controller_controls_mine:** Howard L  Miller → Chillicothe Sand; 1979-06-01 to 1982-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Chillicothe Ready Mix Inc → Chillicothe Sand; 1979-06-06 to 1982-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Howard L  Miller → Chillicothe Ready Mix Inc; 1979-06-06 to 1982-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Hardrock Quarries-Milburn Of St Joseph → Chillicothe Sand; 1982-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Burnham → Chillicothe Sand; 1982-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Burnham → Hardrock Quarries-Milburn Of St Joseph; 1982-10-07 to current/open; source msha-controller-operator-history