# Relationship history for MSHA mine 4801504

Current hierarchy: **Eagle Materials Inc → Mountain Cement Company → Bath Shale 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:** Eagle Materials Inc → Bath Shale Quarry; 1986-01-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Cement Company → Bath Shale Quarry; 1991-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Materials Inc → Mountain Cement Company; 1991-06-01 to current/open; source msha-controller-operator-history