# Relationship history for MSHA mine 2301629

Current hierarchy: **Louis A  Griesemer; John F  Griesemer → Griesemer Stone Company → Griesemer Stone Company Plant No 4**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Griesemer Stone Company → Griesemer Stone Company Plant No 4; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Louis A  Griesemer et al → Griesemer Stone Company Plant No 4; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Louis A  Griesemer et al → Griesemer Stone Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John F  Griesemer et al → Griesemer Stone Company; 1950-01-01 to current/open; source msha-controller-operator-history