# Relationship history for MSHA mine 1601525

Current hierarchy: **Charles C  Dawson; Ryan  Dawson → U.S. Sports Field Sand, LLC → U.S. Sports Field Sand- Kentwood Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Aggregate Reclaimers,LLC → U.S. Sports Field Sand- Kentwood Plant; 2012-04-04 to 2023-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Richard Ryan  Dawson et al → U.S. Sports Field Sand- Kentwood Plant; 2012-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard Ryan  Dawson et al → Aggregate Reclaimers,LLC; 2012-04-04 to 2023-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Margaret  Dawson et al → Aggregate Reclaimers,LLC; 2012-04-04 to 2023-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Geo Manufacturing llc → U.S. Sports Field Sand- Kentwood Plant; 2023-04-07 to 2024-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Charles C Dawson et al → U.S. Sports Field Sand- Kentwood Plant; 2023-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles C Dawson et al → Geo Manufacturing llc; 2023-04-07 to 2024-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Nicole  Dawson et al → Geo Manufacturing llc; 2023-04-07 to 2024-10-07; source msha-controller-operator-history
- **operator_operates_mine:** U.S. Sports Field Sand, LLC → U.S. Sports Field Sand- Kentwood Plant; 2024-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles C  Dawson et al → U.S. Sports Field Sand- Kentwood Plant; 2024-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles C  Dawson et al → U.S. Sports Field Sand, LLC; 2024-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Dawson et al → U.S. Sports Field Sand, LLC; 2024-10-08 to current/open; source msha-controller-operator-history