# Relationship history for MSHA mine 3002803

Current hierarchy: **Michael B  Morey → CHAMPLAIN STONE LTD → FORT ANN SITE**

- 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:** Michael B  Morey → FORT ANN SITE; 1986-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Champlain Stone Ltd → FORT ANN SITE; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael B  Morey → Champlain Stone Ltd; 1987-08-01 to current/open; source msha-controller-operator-history