# Relationship history for MSHA mine 1511087

Current hierarchy: **Bruce J  Schnabel; James D  Klingbell → Dollar Branch Coal Corp → White Oak #4**

- 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

- **controller_controls_mine:** James D  Klingbell et al → White Oak #4; 1977-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dollar Branch Coal Corp → White Oak #4; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James D  Klingbell et al → Dollar Branch Coal Corp; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce J  Schnabel et al → Dollar Branch Coal Corp; 1980-08-01 to current/open; source msha-controller-operator-history