# Relationship history for MSHA mine 1100137

Current hierarchy: **Kistler Glen D → Monmouth Stone Company → MONMOUTH STONE CO.**

- 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:** Monmouth Stone Company → MONMOUTH STONE CO.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kistler Glen D → MONMOUTH STONE CO.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kistler Glen D → Monmouth Stone Company; 1950-01-01 to current/open; source msha-controller-operator-history