# Relationship history for MSHA mine 4103085

Current hierarchy: **B W  Carpenter → Baron Corp → Marble Falls 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

- **operator_operates_mine:** Baron Corp → Marble Falls Quarry; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** B W  Carpenter  et al → Marble Falls Quarry; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B W  Carpenter  et al → Baron Corp; 1981-05-01 to current/open; source msha-controller-operator-history