# Relationship history for MSHA mine 3304375

Current hierarchy: **Thomas  Milligan → Western Ohio Cut Stone LLC → FLAT ROCK QUARRY**

- 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:** Franklin  Hammond → FLAT ROCK QUARRY; 1995-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** F Hammond Rubble Stone Supplies → FLAT ROCK QUARRY; 1996-06-01 to 2009-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Franklin  Hammond → F Hammond Rubble Stone Supplies; 1996-06-01 to 2009-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Milligan → FLAT ROCK QUARRY; 2001-02-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Ohio Cut Stone LLC → FLAT ROCK QUARRY; 2009-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Milligan → Western Ohio Cut Stone LLC; 2009-08-21 to current/open; source msha-controller-operator-history