# Relationship history for MSHA mine 1001422

Current hierarchy: **Jeanne M  (Seubert) McDonough → Seubert Excavators Inc → Portable Crusher No. 4**

- 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:** Jeanne M  (Seubert) McDonough et al → Portable Crusher No. 4; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Long Valley Sand & Gravel Inc → Portable Crusher No. 4; 1979-01-01 to 1991-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Rand E  Walker → Portable Crusher No. 4; 1979-01-01 to 1991-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Rand E  Walker → Long Valley Sand & Gravel Inc; 1979-01-01 to 1991-07-29; source msha-controller-operator-history
- **operator_operates_mine:** Seubert Excavators Inc → Portable Crusher No. 4; 1991-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeanne M  (Seubert) McDonough et al → Seubert Excavators Inc; 1991-07-30 to current/open; source msha-controller-operator-history