# Relationship history for MSHA mine 1202392

Current hierarchy: **Shane B  Coffman; Thomas  Dickman → Tri-County Sand & Gravel LLC → Tri-County Sand & Gravel LLC**

- 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

- **operator_operates_mine:** Clifton Sand & Gravel LLC → Tri-County Sand & Gravel LLC; 2006-10-24 to 2008-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Shane B  Coffman → Tri-County Sand & Gravel LLC; 2006-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shane B  Coffman → Clifton Sand & Gravel LLC; 2006-10-24 to 2008-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Tri-County Sand & Gravel LLC → Tri-County Sand & Gravel LLC; 2008-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Dickman et al → Tri-County Sand & Gravel LLC; 2008-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Dickman et al → Tri-County Sand & Gravel LLC; 2008-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shane B  Coffman et al → Tri-County Sand & Gravel LLC; 2008-04-14 to current/open; source msha-controller-operator-history