# Relationship history for MSHA mine 1700718

Current hierarchy: **S C Holdings Inc → Sargent Corporation → Pioneer 3055 #810005**

- 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:** BILFINGER BERGER AG → Pioneer 3055 #810005; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** S C Holdings Inc → Pioneer 3055 #810005; 1997-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** HE  SARGENT INC → Pioneer 3055 #810005; 2001-08-17 to 2005-07-24; source msha-controller-operator-history
- **controller_controls_operator:** BILFINGER BERGER AG → HE  SARGENT INC; 2001-08-17 to 2005-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Sargent Corporation → Pioneer 3055 #810005; 2005-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S C Holdings Inc → Sargent Corporation; 2005-07-25 to current/open; source msha-controller-operator-history