# Relationship history for MSHA mine 1302501

Current hierarchy: **Corey W Nichols Et AL; Dain E Mann → NISS Excavation, Inc. → NISS Excavation Rock 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:** NISS Excavation, Inc. → NISS Excavation Rock Quarry; 2020-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dain E Mann Et Al → NISS Excavation Rock Quarry; 2020-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dain E Mann Et Al → NISS Excavation, Inc.; 2020-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corey W Nichols Et AL → NISS Excavation, Inc.; 2020-09-26 to current/open; source msha-controller-operator-history