# Relationship history for MSHA mine 1301066

Current hierarchy: **Thomas R  Scott → River Products Company Inc → Morning Sun 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** B W  Carpenter  et al → Morning Sun Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Morning Sun Quarry; 1950-01-01 to 1980-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Morning Sun Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1950-01-01 to 1980-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Thomas R  Scott et al → Morning Sun Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wendling Quarries Inc → Morning Sun Quarry; 1980-07-18 to 1980-10-05; source msha-controller-operator-history
- **controller_controls_operator:** B W  Carpenter  et al → Wendling Quarries Inc; 1980-07-18 to 1980-10-05; source msha-controller-operator-history
- **operator_operates_mine:** River Products Company Inc → Morning Sun Quarry; 1980-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas R  Scott et al → River Products Company Inc; 1980-10-06 to current/open; source msha-controller-operator-history