# Relationship history for MSHA mine 1300686

Current hierarchy: **Manatts Enterprises; Cedar Valley Corp → BMC Aggregates LC → Gilbertville Sand**

- 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:** Hawkeye Sand & Gravel Company → Gilbertville Sand; 1950-01-01 to 1993-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Max  Jensen → Gilbertville Sand; 1950-01-01 to 1993-01-11; source msha-controller-operator-history
- **controller_controls_operator:** Max  Jensen → Hawkeye Sand & Gravel Company; 1950-01-01 to 1993-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Manatts Enterprises et al → Gilbertville Sand; 1982-11-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Basic Materials Corp → Gilbertville Sand; 1993-01-12 to 2006-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Manatts Enterprises et al → Basic Materials Corp; 1993-01-12 to 2006-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Cedar Valley Corp  et al → Basic Materials Corp; 1993-01-12 to 2006-07-31; source msha-controller-operator-history
- **operator_operates_mine:** BMC Aggregates LC → Gilbertville Sand; 2006-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Manatts Enterprises et al → Gilbertville Sand; 2006-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Manatts Enterprises et al → BMC Aggregates LC; 2006-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cedar Valley Corp  et al → BMC Aggregates LC; 2006-08-01 to current/open; source msha-controller-operator-history