# Relationship history for MSHA mine 2700325

Current hierarchy: **Kevin W  Cole Sr. → Raymond Sand & Gravel → Raymond Sand & Gravel**

- 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:** Christopher J  Bolton → Raymond Sand & Gravel; 1992-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C J Bolton Inc → Raymond Sand & Gravel; 1998-04-01 to 1999-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Christopher J  Bolton → C J Bolton Inc; 1998-04-01 to 1999-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Raymond Sand & Gravel → Raymond Sand & Gravel; 1999-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin W  Cole Sr. → Raymond Sand & Gravel; 1999-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin W  Cole Sr. → Raymond Sand & Gravel; 1999-07-13 to current/open; source msha-controller-operator-history