Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1976-11-29
1978-11-21
Caldwell, Sr., John W.
Communications: electrical
Audible indication
Ultrasonic pest control
40541, 40564, 340521, 340366E, G08B 538
Patent
active
041268555
ABSTRACT:
An annunciator readout unit for continuously monitoring and indicating to an operator of a machine such as a grain dryer, the condition and stage of the grain drying process and further including warnings and unusual conditions including a grid structure surrounding a plurality of indicating lights with sealing material between the backing plate and the grid structure and further including composite layers of masks, opaque sheets, a thick clear plastic sheet and a top indicating sheet including a mask portion mating with the grid structure and including clear and colored panels overlying the various indicator lights with printed material formed thereon and wherein due to the structure of the composite sheets light from a particular light source does not fringe into adjacent chambers.
REFERENCES:
patent: 2749541 (1956-06-01), Whittlesey
patent: 3107350 (1963-10-01), Arrasmith
patent: 3594784 (1971-07-01), Femminella
patent: 3618078 (1971-11-01), Wittman et al.
patent: 3717117 (1973-02-01), Stanley
Alms Erhard E.
Mitchell James E.
AFE Industries, Inc.
Caldwell Sr. John W.
Groody James J.
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