# Relationship history for MSHA mine 1000101

Current hierarchy: **Builders Marketplace Inc → Producers Pumice → Rock Hollow**

- 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:** Producers Pumice Inc → Rock Hollow; 1950-01-01 to 1994-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Louie  Hoffman → Rock Hollow; 1950-01-01 to 1994-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Louie  Hoffman → Producers Pumice Inc; 1950-01-01 to 1994-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Producers Pumice → Rock Hollow; 1994-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Builders Marketplace Inc → Rock Hollow; 1994-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Builders Marketplace Inc → Producers Pumice; 1994-06-14 to current/open; source msha-controller-operator-history