# Relationship history for MSHA mine 1901043

Current hierarchy: **Gilbert  Lopes → G Lopes Construction Inc → Murby's Pit / Lippmann Crusher**

- 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:** G Lopes Construction Inc → Murby's Pit / Lippmann Crusher; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gilbert  Lopes et al → Murby's Pit / Lippmann Crusher; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gilbert  Lopes et al → G Lopes Construction Inc; 1994-09-01 to current/open; source msha-controller-operator-history