# Relationship history for MSHA mine 4003246

Current hierarchy: **Fred H  Jones; Dennis  Heitman → Memphis Sand Company, Inc. → Macon Road 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Memphis Sand Company, Inc. → Macon Road Plant; 2004-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis  Heitman et al → Macon Road Plant; 2004-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Heitman et al → Memphis Sand Company, Inc.; 2004-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred H  Jones et al → Memphis Sand Company, Inc.; 2004-10-19 to current/open; source msha-controller-operator-history