# Relationship history for MSHA mine 4801622

Current hierarchy: **Chris  Marshall → ELLINGFORD BROS INC → Crusher #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:** Chris  Marshall  et al → Crusher #4; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ELLINGFORD BROS INC → Crusher #4; 2002-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Marshall  et al → ELLINGFORD BROS INC; 2002-05-30 to current/open; source msha-controller-operator-history