# Relationship history for MSHA mine 4103678

Current hierarchy: **Dennis  Weiss; Christina  Weiss → Back Materials → Back Materials**

- 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:** Back Materials → Back Materials; 1991-06-01 to 2006-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Janet F  Back → Back Materials; 1991-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janet F  Back → Back Materials; 1991-06-01 to 2006-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Back Materials → Back Materials; 2006-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis  Weiss  et al → Back Materials; 2006-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Weiss  et al → Back Materials; 2006-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christina  Weiss  et al → Back Materials; 2006-06-16 to current/open; source msha-controller-operator-history