# Relationship history for MSHA mine 4000775

Current hierarchy: **Andrew D Ferrell → Ferrell Paving, Inc. → MCLEAN SAND PLANT**

- 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:** Allen Materials Inc → MCLEAN SAND PLANT; 1950-01-01 to 1983-01-12; source msha-controller-operator-history
- **controller_controls_mine:** William B  Allen → MCLEAN SAND PLANT; 1950-01-01 to 1983-01-12; source msha-controller-operator-history
- **controller_controls_operator:** William B  Allen → Allen Materials Inc; 1950-01-01 to 1983-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Ferrell Paving, Inc. → MCLEAN SAND PLANT; 1983-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Ferrell et al → MCLEAN SAND PLANT; 1983-01-13 to 2024-05-14; source msha-controller-operator-history
- **controller_controls_operator:** John  Ferrell et al → Ferrell Paving, Inc.; 1983-01-13 to 2024-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Andrew D Ferrell → MCLEAN SAND PLANT; 2024-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew D Ferrell → Ferrell Paving, Inc.; 2024-05-15 to current/open; source msha-controller-operator-history