# Relationship history for MSHA mine 3301509

Current hierarchy: **Howard W Bates; Brian H Bates → The Arms Trucking Co. → Arms 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:** Haueter Sand & Gravel Company → Arms Sand & Gravel; 1950-01-01 to 2015-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Haueter → Arms Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Haueter → Haueter Sand & Gravel Company; 1950-01-01 to 2015-10-31; source msha-controller-operator-history
- **operator_operates_mine:** The Arms Trucking Co. → Arms Sand & Gravel; 2015-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Howard W Bates et al → Arms Sand & Gravel; 2015-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard W Bates et al → The Arms Trucking Co.; 2015-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian H Bates et al → The Arms Trucking Co.; 2015-11-01 to current/open; source msha-controller-operator-history