# Relationship history for MSHA mine 0404863

Current hierarchy: **Andrews Frank J → Amos & Andrews Inc → American Canyon**

- 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:** Andrews Frank J Et Al → American Canyon; 1985-10-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Amos & Andrews Inc → American Canyon; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrews Frank J Et Al → Amos & Andrews Inc; 1987-01-01 to current/open; source msha-controller-operator-history