# Relationship history for MSHA mine 0504535

Current hierarchy: **Ponderosa Trust → M G M-Maple Grove Mill/Mine → MOUNTAIN TOP 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:** Carter Mine Development → MOUNTAIN TOP MINE; 1994-01-01 to 1996-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Henry M  Carter → MOUNTAIN TOP MINE; 1994-01-01 to 1998-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Henry M  Carter → Carter Mine Development; 1994-01-01 to 1996-05-10; source msha-controller-operator-history
- **operator_operates_mine:** M G M-Maple Grove Mill/Mine → MOUNTAIN TOP MINE; 1996-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ponderosa Trust → MOUNTAIN TOP MINE; 1996-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ponderosa Trust → M G M-Maple Grove Mill/Mine; 1996-05-11 to current/open; source msha-controller-operator-history