# Relationship history for MSHA mine 3901534

Current hierarchy: **Eric S  Johner; Kent S  Johner → Johner Gravel, Inc. → Plant 1**

- 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:** Johner & Sons Earthmoving → Plant 1; 2009-01-29 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Kent S  Johner et al → Plant 1; 2009-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kent S  Johner et al → Johner & Sons Earthmoving; 2009-01-29 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Eric S  Johner et al → Johner & Sons Earthmoving; 2009-01-29 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Johner Gravel, Inc. → Plant 1; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eric S  Johner et al → Plant 1; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric S  Johner et al → Johner Gravel, Inc.; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kent S  Johner et al → Johner Gravel, Inc.; 2015-01-01 to current/open; source msha-controller-operator-history