# Relationship history for MSHA mine 0202470

Current hierarchy: **Donald R  Peterson → DPE Materials, Inc → BLAISDELL**

- 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

- **controller_controls_mine:** Donald W  Kelland → BLAISDELL; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Don Kelland Materials Inc → BLAISDELL; 1988-12-01 to 2004-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Donald W  Kelland → Don Kelland Materials Inc; 1988-12-01 to 2004-12-31; source msha-controller-operator-history
- **operator_operates_mine:** DPE Materials, Inc → BLAISDELL; 2005-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald R  Peterson et al → BLAISDELL; 2005-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald R  Peterson et al → DPE Materials, Inc; 2005-01-01 to current/open; source msha-controller-operator-history