# Relationship history for MSHA mine 4500712

Current hierarchy: **Heidelberg Materials AG → Cadman Inc → Cadman Incorporated**

- 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:** Valley Concrete Company → Cadman Incorporated; 1950-01-01 to 1986-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Mc Clure H W → Cadman Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Clure H W → Valley Concrete Company; 1950-01-01 to 1986-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Valley Concrete Company → Cadman Incorporated; 1986-01-17 to 1986-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Pat → Cadman Incorporated; 1986-01-17 to 1986-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Pat → Valley Concrete Company; 1986-01-17 to 1986-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Cadman Concrete Company → Cadman Incorporated; 1986-06-25 to 1991-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Paul J  Taylor  et al → Cadman Incorporated; 1986-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Taylor  et al → Cadman Concrete Company; 1986-06-25 to 1991-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Jon M  Magnussen  et al → Cadman Concrete Company; 1986-06-25 to 1991-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Cadman Inc → Cadman Incorporated; 1991-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Cadman Incorporated; 1991-01-02 to 2000-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Cadman Inc; 1991-01-02 to 2000-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Cadman Incorporated; 2000-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Cadman Inc; 2000-07-21 to current/open; source msha-controller-operator-history