# Relationship history for MSHA mine 3000894

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates New York Inc. → MENDON (TREAT 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:** B R Dewitt Inc → MENDON (TREAT PIT); 1950-01-01 to 1999-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Gene Dewitt Corporation → MENDON (TREAT PIT); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gene Dewitt Corporation → B R Dewitt Inc; 1950-01-01 to 1999-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → MENDON (TREAT PIT); 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Brd Inc → MENDON (TREAT PIT); 1999-11-15 to 2004-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → MENDON (TREAT PIT); 1999-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Brd Inc; 1999-11-15 to 2004-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates New York Inc. → MENDON (TREAT PIT); 2004-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates New York Inc.; 2004-06-28 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → MENDON (TREAT PIT); 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates New York Inc.; 2007-08-23 to current/open; source msha-controller-operator-history