Title:
POLYENE AND PROCESS FOR MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JPS5210242
Kind Code:
A
Abstract:
The keyhole saw has a concentric centring borer mounted at the front end of a hollow boring shaft which forms the centring guide. The centring bore can be retracted by a displacement mechanism from a centred position where its cutting edge protrudes beyond the cutting plane of the saw back into the boring shaft. The displacement mechanism has a sliding guide longitudinally passing through the boring shaft, and a screw slide connected to the centring borer and projecting through the sliding guide.
Inventors:
GERII RII ORUSON
Application Number:
JP8045376A
Publication Date:
January 26, 1977
Filing Date:
July 08, 1976
Export Citation:
Assignee:
HOFFMANN LA ROCHE
International Classes:
A61K31/07; A23L1/275; A61P3/02; C07C47/228; C07C67/00; C07C401/00; C07C403/00; C07C403/02; C07C403/14; C07D309/22; C07D309/30; (IPC1-7): A23L1/27; A61K31/11; C07C47/45; C07D309/22