# Relationship history for MSHA mine 0200620

Current hierarchy: **DCM Gravel Inc & Davis Family Trust → Tacna Sand & Gravel LLC → TACNA 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:** Don Kelland Materials Inc → TACNA SAND & GRAVEL LLC; 1950-01-01 to 2000-12-28; source msha-controller-operator-history
- **controller_controls_mine:** Donald W  Kelland → TACNA SAND & GRAVEL LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald W  Kelland → Don Kelland Materials Inc; 1950-01-01 to 2000-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Tacna Sand & Gravel LLC → TACNA SAND & GRAVEL LLC; 2000-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** DCM Gravel Inc & Davis Family Trust → TACNA SAND & GRAVEL LLC; 2000-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DCM Gravel Inc & Davis Family Trust → Tacna Sand & Gravel LLC; 2000-12-29 to current/open; source msha-controller-operator-history