# Relationship history for MSHA mine 0800642

Current hierarchy: **Morse Robert B → Central Florida Clay & Fill Inc → Highway 50 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:** Central Florida Clay & Fill Inc → Highway 50 Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Morse Robert B → Highway 50 Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morse Robert B → Central Florida Clay & Fill Inc; 1950-01-01 to current/open; source msha-controller-operator-history