# Relationship history for MSHA mine 2700358

Current hierarchy: **Carl E  Blaisdell; Kenneth D  Blaisdell; Roscoe T  Blaisdell → Blaisdell Sand & Gravel → Blaisdell 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:** Blaisdell Sand & Gravel → Blaisdell Sand & Gravel; 2000-09-01 to 2011-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Katharine  Blaisdell → Blaisdell Sand & Gravel; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Katharine  Blaisdell → Blaisdell Sand & Gravel; 2000-09-01 to 2011-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Blaisdell Sand & Gravel → Blaisdell Sand & Gravel; 2011-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roscoe T  Blaisdell et al → Blaisdell Sand & Gravel; 2011-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roscoe T  Blaisdell et al → Blaisdell Sand & Gravel; 2011-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth D  Blaisdell et al → Blaisdell Sand & Gravel; 2011-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl E  Blaisdell et al → Blaisdell Sand & Gravel; 2011-04-05 to current/open; source msha-controller-operator-history