# Relationship history for MSHA mine 0801020

Current hierarchy: **Steven C  Desrosiers; Norman C  Desrosiers → Desrosiers Brothers Enterprises → PIT NO 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Desrosiers Brothers Enterprises → PIT NO 1; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Norman C  Desrosiers  et al → PIT NO 1; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norman C  Desrosiers  et al → Desrosiers Brothers Enterprises; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven C  Desrosiers  et al → Desrosiers Brothers Enterprises; 1984-10-01 to current/open; source msha-controller-operator-history