# Relationship history for MSHA mine 4503713

Current hierarchy: **Lance  Despain → Pyramid Materials Inc. → Plant #2**

- 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:** Pyramid Materials Inc. → Plant #2; 2013-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lance  Despain → Plant #2; 2013-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lance  Despain → Pyramid Materials Inc.; 2013-03-21 to current/open; source msha-controller-operator-history