# Relationship history for MSHA mine 1504263

Current hierarchy: **W Scott  McGeorge → Pine Bluff Materials Co LLC → Dredge Pine Bluff**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** W Scott  McGeorge et al → Dredge Pine Bluff; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Materials Company-Div/Ingram Industries → Dredge Pine Bluff; 1950-01-01 to 2011-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Ingram Industries Inc → Dredge Pine Bluff; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ingram Industries Inc → Ingram Materials Company-Div/Ingram Industries; 1950-01-01 to 2011-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Pine Bluff Materials LLC → Dredge Pine Bluff; 2011-07-29 to 2012-03-11; source msha-controller-operator-history
- **controller_controls_operator:** W Scott  McGeorge et al → Pine Bluff Materials LLC; 2011-07-29 to 2012-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Pine Bluff Materials Co LLC → Dredge Pine Bluff; 2012-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** W Scott  McGeorge et al → Dredge Pine Bluff; 2012-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W Scott  McGeorge et al → Pine Bluff Materials Co LLC; 2012-03-12 to current/open; source msha-controller-operator-history