# Relationship history for MSHA mine 1100030

Current hierarchy: **Richard F  Hatzer → Valley View Industries, Inc. → McDowell 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:** Chenoa Stone Company → McDowell Quarry; 1950-01-01 to 1983-09-28; source msha-controller-operator-history
- **controller_controls_mine:** Chenoa Stone Company → McDowell Quarry; 1950-01-01 to 1983-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Chenoa Stone Company → Chenoa Stone Company; 1950-01-01 to 1983-09-28; source msha-controller-operator-history
- **controller_controls_mine:** Richard F  Hatzer → McDowell Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Valley View Industries Inc → McDowell Quarry; 1983-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard F  Hatzer → Valley View Industries Inc; 1983-09-29 to current/open; source msha-controller-operator-history