(19)
(11)
EP 0 042 870 A1
(12)
(43)
Date of publication:
06.01.1982
Bulletin 1982/01
(21)
Application number:
81900383.0
(22)
Date of filing:
30.12.1980
(51)
International Patent Classification (IPC):
G11B
15/
00
( . )
G11B
27/
13
( . )
G11B
15/
02
( . )
G11B
27/
32
( . )
(86)
International application number:
PCT/US1980/001754
(87)
International publication number:
WO 1981/001902
(
09.07.1981
Gazette 1981/16)
(84)
Designated Contracting States:
AT CH DE FR GB LI LU NL SE
(30)
Priority:
31.12.1979
US 19790109745
(71)
Applicants:
ADAMS, Robert M.
Dallas, TX 75209 (US)
CAVE, Ellis K.
Garland, TX 75040 (US)
(72)
Inventors:
ADAMS, Robert M.
Dallas, TX 75209 (US)
CAVE, Ellis K.
Garland, TX 75040 (US)
(54)
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