# Relationship history for MSHA mine 2402453

Current hierarchy: **David G  Turk → K'n'R Sand & Gravel → K'n'R 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Johnston Sand & Gravel → K'n'R Sand & Gravel; 2006-06-01 to 2010-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Jerry R.  Johnston → K'n'R Sand & Gravel; 2006-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry R.  Johnston → Johnston Sand & Gravel; 2006-06-01 to 2010-05-17; source msha-controller-operator-history
- **operator_operates_mine:** K'n'R Sand & Gravel → K'n'R Sand & Gravel; 2010-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David G  Turk → K'n'R Sand & Gravel; 2010-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David G  Turk → K'n'R Sand & Gravel; 2010-05-18 to current/open; source msha-controller-operator-history