# Relationship history for MSHA mine 0301624

Current hierarchy: **Anthony C W → C W Anthony Sand & Gravel → C W Anthony Pit**

- 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:** C W Anthony Sand & Gravel → C W Anthony Pit; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Anthony C W → C W Anthony Pit; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony C W → C W Anthony Sand & Gravel; 1987-03-01 to current/open; source msha-controller-operator-history