# Relationship history for MSHA mine 2601232

Current hierarchy: **Thiriot James W → Lascom → Portable 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:** Thiriot Sand & Gravel → Portable Plant; 1980-02-01 to 1986-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Thiriot Jim & Doug → Portable Plant; 1980-02-01 to 1986-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Thiriot Jim & Doug → Thiriot Sand & Gravel; 1980-02-01 to 1986-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Lascom → Portable Plant; 1986-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thiriot James W → Portable Plant; 1986-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thiriot James W → Lascom; 1986-10-09 to current/open; source msha-controller-operator-history