# Relationship history for MSHA mine 1401728

Current hierarchy: **Shaun  Buechel; Dominique  Von Wald; Michael  Buechel → Buechel Stone Corp → Portable Unit**

- 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:** Timothy A  Buechel → Portable Unit; 1979-01-01 to 2016-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Pray → Portable Unit; 1985-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pray Stone Company, Inc. → Portable Unit; 2011-03-22 to 2020-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Pray → Pray Stone Company, Inc.; 2011-03-22 to 2020-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Buechel et al → Portable Unit; 2017-01-01 to 2025-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Buechel Stone Corp → Portable Unit; 2020-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Buechel et al → Buechel Stone Corp; 2020-06-09 to 2025-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Buechel et al → Buechel Stone Corp; 2020-06-09 to 2025-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Timothy A  Buechel → Buechel Stone Corp; 2020-06-09 to 2016-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Dominique  Von Wald → Portable Unit; 2025-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dominique  Von Wald → Buechel Stone Corp; 2025-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Buechel → Buechel Stone Corp; 2025-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shaun  Buechel → Buechel Stone Corp; 2025-01-08 to current/open; source msha-controller-operator-history