# Relationship history for MSHA mine 3000938

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast-NY LLC → Phelps 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

- **controller_controls_mine:** Gene Dewitt Corporation → Phelps Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ontario Materials Inc → Phelps Mine; 1950-01-01 to 1987-07-06; source msha-controller-operator-history
- **controller_controls_mine:** John M Roberts → Phelps Mine; 1950-01-01 to 1987-07-06; source msha-controller-operator-history
- **controller_controls_operator:** John M Roberts → Ontario Materials Inc; 1950-01-01 to 1987-07-06; source msha-controller-operator-history
- **operator_operates_mine:** B R Dewitt Inc → Phelps Mine; 1987-07-07 to 1999-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Gene Dewitt Corporation → B R Dewitt Inc; 1987-07-07 to 1999-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Phelps Mine; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Brd Inc → Phelps Mine; 1999-11-15 to 2004-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Phelps Mine; 1999-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Brd Inc; 1999-11-15 to 2004-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Inc → Phelps Mine; 2004-03-26 to 2004-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Inc; 2004-03-26 to 2004-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast-NY LLC → Phelps Mine; 2004-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast-NY LLC; 2004-06-21 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Phelps Mine; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Inc; 2007-08-23 to 2004-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Phelps Mine; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast-NY LLC; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Phelps Mine; 2021-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Hanson Aggregates Inc; 2021-10-01 to 2004-06-20; source msha-controller-operator-history