# Relationship history for MSHA mine 4702496

Current hierarchy: **James F  Melvin → F M Sand & Gravel Inc → Bauer 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:** F M Sand & Gravel Inc → Bauer Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James F  Melvin → Bauer Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James F  Melvin → F M Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history