# Relationship history for MSHA mine 2401790

Current hierarchy: **Lease R Wayne → Montex Industries → M & B Placer**

- 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:** M & B Mining Company → M & B Placer; 1985-05-01 to 1985-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Montex Industries Corp & Bartech Metallurgical Ind → M & B Placer; 1985-05-01 to 1985-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Montex Industries Corp & Bartech Metallurgical Ind → M & B Mining Company; 1985-05-01 to 1985-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Lease R Wayne → M & B Placer; 1985-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Montex Industries → M & B Placer; 1985-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lease R Wayne → Montex Industries; 1985-06-07 to current/open; source msha-controller-operator-history