# Relationship history for MSHA mine 1302204

Current hierarchy: **Manatts Enterprises; Cedar Valley Corp → BMC Aggregates LC → Portable Sand Plant #105**

- 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:** North Iowa Sand & Gravel Inc → Portable Sand Plant #105; 1996-02-01 to 2024-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Robert C Tuttle → Portable Sand Plant #105; 1996-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C Tuttle → North Iowa Sand & Gravel Inc; 1996-02-01 to 2024-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Manatts Enterprises et al → Portable Sand Plant #105; 2006-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BMC Aggregates LC → Portable Sand Plant #105; 2024-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Manatts Enterprises et al → BMC Aggregates LC; 2024-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cedar Valley Corp  et al → BMC Aggregates LC; 2024-09-05 to current/open; source msha-controller-operator-history