# Relationship history for MSHA mine 3501054

Current hierarchy: **Philpott Lee F → Elpeco Inc → Elpeco Portable**

- 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

- **operator_operates_mine:** Sun Studs Inc → Elpeco Portable; 1950-01-01 to 1978-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Fred  Sohn → Elpeco Portable; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Sohn → Sun Studs Inc; 1950-01-01 to 1978-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Edward G → Elpeco Portable; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lookingglass Construction & Rock Quarry → Elpeco Portable; 1978-03-15 to 1980-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Zeigler Edward G → Lookingglass Construction & Rock Quarry; 1978-03-15 to 1980-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Brandt Berkeley Jr Family Trust → Elpeco Portable; 1979-10-30 to 1985-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Umpqua Sand & Gravel Company → Elpeco Portable; 1980-04-24 to 1985-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Brandt Berkeley Jr Family Trust → Umpqua Sand & Gravel Company; 1980-04-24 to 1985-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Elpeco Inc → Elpeco Portable; 1985-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Philpott Lee F → Elpeco Portable; 1985-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philpott Lee F → Elpeco Inc; 1985-06-12 to current/open; source msha-controller-operator-history