# Relationship history for MSHA mine 3102297

Current hierarchy: **Rex R  Halso → H & C Grading LLC → Carter Sand Mine**

- 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:** H & C Grading LLC → Carter Sand Mine; 2014-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles E  Carter Sr et al → Carter Sand Mine; 2014-12-16 to 2018-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Charles E  Carter Sr et al → H & C Grading LLC; 2014-12-16 to 2018-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Rex R  Halso et al → H & C Grading LLC; 2014-12-16 to 2018-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Rex R  Halso → Carter Sand Mine; 2018-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rex R  Halso → H & C Grading LLC; 2018-01-29 to current/open; source msha-controller-operator-history