# Relationship history for MSHA mine 4701111

Current hierarchy: **Kristopher P  Bjoin; Shaun M  Bjoin; Jonathan M  Bjoin → Bjoin Limestone Inc → Portable Unit #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Kathleen M  Bjoin et al → Portable Unit #1; 1950-01-01 to 2014-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Onsgard Limestone → Portable Unit #1; 1950-01-01 to 1978-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Onsgard Limestone → Portable Unit #1; 1950-01-01 to 1978-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Onsgard Limestone → Onsgard Limestone; 1950-01-01 to 1978-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Bjoin Limestone Inc → Portable Unit #1; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kathleen M  Bjoin et al → Bjoin Limestone Inc; 1978-07-01 to 2014-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Shaun M  Bjoin → Portable Unit #1; 2014-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shaun M  Bjoin → Bjoin Limestone Inc; 2014-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan M  Bjoin → Bjoin Limestone Inc; 2014-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kristopher P  Bjoin → Bjoin Limestone Inc; 2014-05-01 to current/open; source msha-controller-operator-history