Inventor
Tsugio Hida
Inventor
Omuta, JP
Overview
Patents· 1 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Dprimary
E21DShafts50%
E21FSafety devices, transport, filling-up, rescue, ventilation, or draining in or of mines or tunnels50%
PatentTitleYear
5,022,789'Method and machine for constructing shafts'1991Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1991Patents assigned to SHIMIZU CONSTRUCTION CO LTD (1)· patent assignee history
1991Based in Omuta, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SHIMIZU CONSTRUCTION CO LTD | 1 | 1991 |
Locations
| Location | Patents | Span |
|---|---|---|
| Omuta, JP | 1 | 1991 |