# Relationship history for MSHA mine 3303781

Current hierarchy: **David L Oeder; Donald C Oeder; Doug P Oeder → Oeder & Sons Garage Inc. → Oeder & Sons 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

- **operator_operates_mine:** Oeder & Sons Garage Inc. → Oeder & Sons Sand & Gravel; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl E Oeder → Oeder & Sons Sand & Gravel; 1979-01-01 to 2021-10-20; source msha-controller-operator-history
- **controller_controls_operator:** Carl E Oeder → Oeder & Sons Garage Inc.; 1979-01-01 to 2021-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Donald C Oeder et al → Oeder & Sons Sand & Gravel; 2021-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald C Oeder et al → Oeder & Sons Garage Inc.; 2021-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David L Oeder et al → Oeder & Sons Garage Inc.; 2021-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doug P Oeder et al → Oeder & Sons Garage Inc.; 2021-10-21 to current/open; source msha-controller-operator-history