# Relationship history for MSHA mine 1518766

Current hierarchy: **W Scott  McGeorge → Pine Bluff Sand & Gravel Company → Cumberland River Quarry**

- 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:** W Scott  McGeorge et al → Cumberland River Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Titan Cement Co S A - Tarmac Plc Et Al → Cumberland River Quarry; 1992-12-14 to 2002-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Titan Cement International S A → Cumberland River Quarry; 2002-03-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jim Smith Contracting Co LLC → Cumberland River Quarry; 2004-06-02 to 2007-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rex  Smith → Cumberland River Quarry; 2004-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Smith → Jim Smith Contracting Co LLC; 2004-06-02 to 2007-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Roanoke Cement Company LLC → Cumberland River Quarry; 2007-04-01 to 2010-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Titan Cement Co S A - Tarmac Plc Et Al → Roanoke Cement Company LLC; 2007-04-01 to 2002-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Titan Cement International S A → Roanoke Cement Company LLC; 2007-04-01 to 2010-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Pine Bluff Sand & Gravel Company → Cumberland River Quarry; 2010-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W Scott  McGeorge et al → Pine Bluff Sand & Gravel Company; 2010-04-01 to current/open; source msha-controller-operator-history