# Relationship history for MSHA mine 1002200

Current hierarchy: **Douglas  Walters; Lori  Holden → Valley Ready Mix, Inc. → Shelley Pit**

- 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:** David Z  Walters → Shelley Pit; 1981-04-01 to 2026-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Valley Ready Mix, Inc. → Shelley Pit; 2010-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David Z  Walters → Valley Ready Mix, Inc.; 2010-02-08 to 2026-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Lori  Holden et al → Shelley Pit; 2026-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lori  Holden et al → Valley Ready Mix, Inc.; 2026-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Walters et al → Valley Ready Mix, Inc.; 2026-04-23 to current/open; source msha-controller-operator-history