1. Apparatus for counting a series of moving objects comprising: first and second spaced fluidic sensors each comprising means issuing a stream of fluid into the path of the moving objects and means issuing a signal each time an object is in the associated stream of fluid; counter means; count-control means interposed between the sensors and the counter means; means transmitting each said signal issued from the first sensor to the count-control means causing a count signal to be issued from the count-control means; means transmitting each said signal issued from the second sensor to the count-control means disabling the count-control means and thereby preventing issuance of a count signal from the count-control means; said counter means being in controlled communication with the count-control means registering a single count only after the occurrence of said count signal and said disabled state.

2. Apparatus for counting each container in a single row of containers comprising: source means supplying fluid under pressure; spaced fluidic sensors; means communicating fluid derived from the source means to the fluidic sensors; each sensor having an outlet opening from which an effluent stream of fluid issues; means serially displacing the row of containers relative to the fluidic sensors first into one effluent stream of fluid and then into the other effluent stream of fluid; fluidic gate means comprising (a) influent means to which fluid pressure derived from the source means is communicated, (b) spaced effluent means from which fluid pressure is selectively issued and (c) control means to which back pressure from either sensor caused by imposition of each container within the effluent stream of that sensor is communicated to select the effluent port from which fluid pressure issues; counter means; means communicating pressure issued from one of the two effluent means of the fluidic gate means to the counter means; said counter means sensing fluid pressure issued from the one effluent means and subsequently sensing the lack of fluid pressure from the one effluent means and registering a single count only when a high-pressure state followed by a low-pressure state at the one effluent means has been sensed by the counter means.

3. Apparatus for counting a series of moving objects comprising: first and second spaced fluidic sensors each comprising means issuing a stream of fluid intO the path of the objects moving objects and means issuing a signal each time an object is in the associated stream of fluid; counter means; count-control means interposed between the sensors and the counter means; means transmitting each said signal issued from the first sensor to the count-control means causing a count signal to be issued from the count-control means to the counter means; means transmitting each said signal issued from the second sensor to the count-control means disabling the count-control means and thereby preventing issuance of a count signal from the count-control means to the counter means; said counter means sensing both a count signal and the disabled state of the count-control means and registering a single count only after sensing said count signal and said disabled state.