# Relationship history for MSHA mine 4500659

Current hierarchy: **Hanson PLC → Acme Materials & Construction Company → MATHESON 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Acme Concrete Company → MATHESON PIT; 1950-01-01 to 1988-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Donald H  Herak → MATHESON PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald H  Herak → Acme Concrete Company; 1950-01-01 to 1988-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Acme Concrete Company → MATHESON PIT; 1988-07-15 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → MATHESON PIT; 1988-07-15 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Acme Concrete Company; 1988-07-15 to 1988-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Acme Materials & Construction Company → MATHESON PIT; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → MATHESON PIT; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Acme Materials & Construction Company; 1988-11-14 to current/open; source msha-controller-operator-history