# Relationship history for MSHA mine 3001278

Current hierarchy: **Harter Michael P → Harvey Sand & Gravel → Harvey'S**

- 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:** West Winfield Sand & Gravel Corp → Harvey'S; 1950-01-01 to 1983-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Hurtubise James A → Harvey'S; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hurtubise James A → West Winfield Sand & Gravel Corp; 1950-01-01 to 1983-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Strata Stone Products Ltd → Harvey'S; 1983-02-01 to 1985-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Joedicke James → Harvey'S; 1983-02-01 to 1985-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Joedicke James → Strata Stone Products Ltd; 1983-02-01 to 1985-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Harvey Sand & Gravel → Harvey'S; 1985-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harter Michael P → Harvey'S; 1985-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harter Michael P → Harvey Sand & Gravel; 1985-08-08 to current/open; source msha-controller-operator-history