# Relationship history for MSHA mine 4503441

Current hierarchy: **Derek C  Adamire → A & A Rock Inc → A & A  Rock Inc.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Andersen & Sons Gravel → A & A  Rock Inc.; 2000-05-01 to 2018-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Andrew  Andersen  et al → A & A  Rock Inc.; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Andersen  et al → Andersen & Sons Gravel; 2000-05-01 to 2018-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Eric  Andersen  et al → Andersen & Sons Gravel; 2000-05-01 to 2018-05-30; source msha-controller-operator-history
- **operator_operates_mine:** A & A Rock Inc → A & A  Rock Inc.; 2018-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Derek C  Adamire → A & A  Rock Inc.; 2018-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derek C  Adamire → A & A Rock Inc; 2018-05-31 to current/open; source msha-controller-operator-history