# Relationship history for MSHA mine 1301953

Current hierarchy: **James H  Dingeman → Marion County Limestone Company Ltd → Portable 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:** Geery Construction Company → Portable Plant #1; 1980-06-01 to 1987-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Geery Darroll → Portable Plant #1; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geery Darroll → Geery Construction Company; 1980-06-01 to 1987-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Marion County Limestone Company Ltd → Portable Plant #1; 1987-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James H  Dingeman → Portable Plant #1; 1987-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James H  Dingeman → Marion County Limestone Company Ltd; 1987-02-19 to current/open; source msha-controller-operator-history