# Relationship history for MSHA mine 0400226

Current hierarchy: **Federal White Cement Ltd → F W Aggregate Inc → Dolomite Mine**

- 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:** Industrial Rock Products → Dolomite Mine; 1950-01-01 to 1981-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Anderson Robert P → Dolomite Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Robert P → Industrial Rock Products; 1950-01-01 to 1981-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Mills & Castro Marble Company Inc → Dolomite Mine; 1981-07-17 to 1984-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Donald E  Mills → Dolomite Mine; 1981-07-17 to 1984-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Donald E  Mills → Mills & Castro Marble Company Inc; 1981-07-17 to 1984-11-13; source msha-controller-operator-history
- **operator_operates_mine:** M & C Marble Company Inc → Dolomite Mine; 1984-11-14 to 1988-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Abraham  Krangel → Dolomite Mine; 1984-11-14 to 1988-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Abraham  Krangel → M & C Marble Company Inc; 1984-11-14 to 1988-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Inyo Marble Company → Dolomite Mine; 1988-05-02 to 1991-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Arland D  Dunn → Dolomite Mine; 1988-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arland D  Dunn → Inyo Marble Company; 1988-05-02 to 1991-06-19; source msha-controller-operator-history
- **operator_operates_mine:** F W Aggregate Inc → Dolomite Mine; 1991-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Federal White Cement Ltd → Dolomite Mine; 1991-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Federal White Cement Ltd → F W Aggregate Inc; 1991-06-20 to current/open; source msha-controller-operator-history