# Relationship history for MSHA mine 1302173

Current hierarchy: **Manatts Enterprises; Cedar Valley Corp → BMC Aggregates LC → Waterloo South Quarry**

- 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

- **controller_controls_mine:** Cedar Valley Corp  et al → Waterloo South Quarry; 1982-11-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Basic Materials Corp → Waterloo South Quarry; 1990-02-01 to 2006-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Cedar Valley Corp  et al → Basic Materials Corp; 1990-02-01 to 2006-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Manatts Enterprises et al → Basic Materials Corp; 1990-02-01 to 2006-07-31; source msha-controller-operator-history
- **operator_operates_mine:** BMC Aggregates LC → Waterloo South Quarry; 2006-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cedar Valley Corp  et al → Waterloo South Quarry; 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
- **controller_controls_operator:** Manatts Enterprises et al → BMC Aggregates LC; 2006-08-01 to current/open; source msha-controller-operator-history