# Relationship history for MSHA mine 2002730

Current hierarchy: **Ashlei E Saxton; Colter M Saxton → Saxton Sand and Gravel Inc → Saxton Sand and 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:** Houghton Lake Block Company Inc → Saxton Sand and Gravel; 1985-05-01 to 1987-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Anderson Kenneth J → Saxton Sand and Gravel; 1985-05-01 to 1987-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Kenneth J → Houghton Lake Block Company Inc; 1985-05-01 to 1987-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Porath Sand & Gravel → Saxton Sand and Gravel; 1987-08-01 to 2024-03-31; source msha-controller-operator-history
- **controller_controls_mine:** James L Porath → Saxton Sand and Gravel; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L Porath → Porath Sand & Gravel; 1987-08-01 to 2024-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Saxton Sand and Gravel Inc → Saxton Sand and Gravel; 2024-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colter M Saxton et al → Saxton Sand and Gravel; 2024-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colter M Saxton et al → Saxton Sand and Gravel Inc; 2024-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashlei E Saxton et al → Saxton Sand and Gravel Inc; 2024-04-01 to current/open; source msha-controller-operator-history