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Optical indication and operation monitoring unit for vacuum cleaners
US 4,767,213 A
Filed
: 02/02/1987
Issued
: 08/30/1988
Est. Priority Date
: 02/05/1986
Status: Expired due to Term
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Current Assignee
Interlava AG
Original Assignee
Interlava AG
Inventors
Hummel, Karl
Primary Examiner(s)
NOT, DEFINED
Assistant Examiner(s)
Koren, Matthew W.
Application Number
US07/009,741
Time in Patent Office
575 Days
Field of Search
356/338, 356/438, 356/439, 250/574, 15/319, 15/339
US Class Current
356/338
CPC Class Codes
A47L 9/2815
using optical detectors
A47L 9/2821
Pressure, vacuum level or a...
A47L 9/2857
User input or output elemen...
A47L 9/2884
Details of arrangements of ...
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