# Relationship history for MSHA mine 0801154

Current hierarchy: **Pioneer Ag-Chem Inc → Supermag L C → Supermag, L.C.**

- 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:** Super Mag Lc → Supermag, L.C.; 1991-03-01 to 1998-10-26; source msha-controller-operator-history
- **controller_controls_mine:** James H  Hall et al → Supermag, L.C.; 1991-03-01 to 1998-10-26; source msha-controller-operator-history
- **controller_controls_operator:** James H  Hall et al → Super Mag Lc; 1991-03-01 to 1998-10-26; source msha-controller-operator-history
- **operator_operates_mine:** Supermag L C → Supermag, L.C.; 1998-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer Ag-Chem Inc → Supermag, L.C.; 1998-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer Ag-Chem Inc → Supermag L C; 1998-10-27 to current/open; source msha-controller-operator-history