# Relationship history for MSHA mine 0403763

Current hierarchy: **William C  Brooks → Tapo Oyster Shell → Tapo Oyster Shell**

- 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:** Tapo Oyster Shell → Tapo Oyster Shell; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William C  Brooks → Tapo Oyster Shell; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William C  Brooks → Tapo Oyster Shell; 1950-01-01 to current/open; source msha-controller-operator-history