# Relationship history for MSHA mine 3608657

Current hierarchy: **Summerville Richard → Advantage Gravel & Topsoil → SUMMERVILLE 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:** Advantage Gravel & Topsoil → SUMMERVILLE PIT; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Summerville Richard → SUMMERVILLE PIT; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summerville Richard → Advantage Gravel & Topsoil; 1997-07-01 to current/open; source msha-controller-operator-history