# Relationship history for MSHA mine 1512692

Current hierarchy: **Bruce J  Schnabel; James D  Klingbell → Independence Tipple Company → Prep Plant #1**

- 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:** Independence Tipple Company → Prep Plant #1; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bruce J  Schnabel et al → Prep Plant #1; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce J  Schnabel et al → Independence Tipple Company; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James D  Klingbell et al → Independence Tipple Company; 1981-01-01 to current/open; source msha-controller-operator-history