# Relationship history for MSHA mine 3003842

Current hierarchy: **David  Spallina → Spallina Materials, Inc → MacDuffie 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:** David  Spallina → MacDuffie Sand & Gravel; 2006-07-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** MacDuffie Sand & Gravel → MacDuffie Sand & Gravel; 2012-04-10 to 2022-04-10; source msha-controller-operator-history
- **controller_controls_mine:** Theodore M  MacDuffie → MacDuffie Sand & Gravel; 2012-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Theodore M  MacDuffie → MacDuffie Sand & Gravel; 2012-04-10 to 2022-04-10; source msha-controller-operator-history
- **operator_operates_mine:** Spallina Materials, Inc → MacDuffie Sand & Gravel; 2022-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Spallina → Spallina Materials, Inc; 2022-04-11 to current/open; source msha-controller-operator-history