# Relationship history for MSHA mine 1202504

Current hierarchy: **Polycor Inc → Indiana Limestone Co → Victor Underground**

- 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:** Limestone Holdings Corporation → Victor Underground; 2014-05-02 to 2014-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Wynnchurch Capital → Victor Underground; 2014-05-13 to 2018-10-10; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → Victor Underground; 2018-10-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Indiana Limestone Co → Victor Underground; 2020-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Limestone Holdings Corporation → Indiana Limestone Co; 2020-08-03 to 2014-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Wynnchurch Capital → Indiana Limestone Co; 2020-08-03 to 2018-10-10; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Indiana Limestone Co; 2020-08-03 to current/open; source msha-controller-operator-history