# Relationship history for MSHA mine 3609286

Current hierarchy: **Frank Bryan Inc → Georgetown Sand & Gravel → Dredge Thaddus Carr**

- 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:** USS Holdings Inc → Dredge Thaddus Carr; 1996-03-09 to 2003-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Frank Bryan Inc → Dredge Thaddus Carr; 1996-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Dredge Thaddus Carr; 2000-08-04 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Dredge Thaddus Carr; 2003-07-19 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates PMA Inc → Dredge Thaddus Carr; 2004-11-02 to 2008-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates PMA Inc; 2004-11-02 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Dredge Thaddus Carr; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates PMA Inc; 2007-08-23 to 2008-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates BMC Inc → Dredge Thaddus Carr; 2009-01-01 to 2020-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates BMC Inc; 2009-01-01 to 2020-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates BMC Inc; 2009-01-01 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → Hanson Aggregates BMC Inc; 2009-01-01 to 2003-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Georgetown Sand & Gravel → Dredge Thaddus Carr; 2020-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank Bryan Inc → Georgetown Sand & Gravel; 2020-02-25 to current/open; source msha-controller-operator-history