# Relationship history for MSHA mine 2700484

Current hierarchy: **John H  Rolfe → J H Rolfe Construction Co LLC → Phoenix 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:** J H Rolfe Construction Co LLC → Phoenix Crusher; 2014-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John H  Rolfe → Phoenix Crusher; 2014-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John H  Rolfe → J H Rolfe Construction Co LLC; 2014-08-20 to current/open; source msha-controller-operator-history