# Relationship history for MSHA mine 2000761

Current hierarchy: **Ray  Oppenhuizen → Newaygo County Redi-Mix Inc → Croton Pit**

- 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:** K-V Gravel Company → Croton Pit; 1950-01-01 to 1990-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Kolk Harold → Croton Pit; 1950-01-01 to 1990-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Kolk Harold → K-V Gravel Company; 1950-01-01 to 1990-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Newaygo County Redi-Mix Inc → Croton Pit; 1990-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ray  Oppenhuizen  et al → Croton Pit; 1990-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Oppenhuizen  et al → Newaygo County Redi-Mix Inc; 1990-02-01 to current/open; source msha-controller-operator-history