# Relationship history for MSHA mine 1001929

Current hierarchy: **Douglas  Walters; Lori  Holden → Walters Ready Mix Inc → Teton 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

- **operator_operates_mine:** Walters Ready Mix Inc → Teton Pit; 1997-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David Z  Walters → Teton Pit; 2002-07-04 to 2026-04-22; source msha-controller-operator-history
- **controller_controls_operator:** David Z  Walters → Walters Ready Mix Inc; 2002-07-04 to 2026-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Walters et al → Teton Pit; 2026-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Walters et al → Walters Ready Mix Inc; 2026-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lori  Holden et al → Walters Ready Mix Inc; 2026-04-23 to current/open; source msha-controller-operator-history