# Relationship history for MSHA mine 0301593

Current hierarchy: **W Scott  McGeorge → Pine Bluff Sand & Gravel Company → Morrison Bluff 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 → Morrison Bluff Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** River Mountain Quarry Inc → Morrison Bluff Quarry; 1985-05-01 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Daryl  Jackson → Morrison Bluff Quarry; 1985-05-01 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Daryl  Jackson → River Mountain Quarry Inc; 1985-05-01 to 1987-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Arkansas Sandstone Inc → Morrison Bluff Quarry; 1988-01-01 to 1991-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Jetton Michael → Morrison Bluff Quarry; 1988-01-01 to 1991-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Jetton Michael → Arkansas Sandstone Inc; 1988-01-01 to 1991-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Pine Bluff Sand & Gravel Company → Morrison Bluff Quarry; 1991-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W Scott  McGeorge et al → Pine Bluff Sand & Gravel Company; 1991-10-10 to current/open; source msha-controller-operator-history