US3906752A - Latch detector stop motion system for circular knitting machines - Google Patents

Latch detector stop motion system for circular knitting machines Download PDF

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Publication number
US3906752A
US3906752A US449066A US44906674A US3906752A US 3906752 A US3906752 A US 3906752A US 449066 A US449066 A US 449066A US 44906674 A US44906674 A US 44906674A US 3906752 A US3906752 A US 3906752A
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output
flip
inputs
relay
probe
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US449066A
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English (en)
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Peter C Eichhorst
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Priority to US449066A priority Critical patent/US3906752A/en
Priority to CA197,933A priority patent/CA995335A/en
Priority to GB1764474A priority patent/GB1406598A/en
Priority to NL7405544A priority patent/NL7405544A/xx
Priority to IT50747/74A priority patent/IT1011348B/it
Priority to FR7417378A priority patent/FR2263326B1/fr
Priority to AU69551/74A priority patent/AU478054B2/en
Priority to CH742374A priority patent/CH582263A5/xx
Priority to JP49062459A priority patent/JPS50118056A/ja
Priority to DE19742427079 priority patent/DE2427079A1/de
Priority to ES427393A priority patent/ES427393A1/es
Priority to BR7416/74A priority patent/BR7407416A/pt
Application granted granted Critical
Publication of US3906752A publication Critical patent/US3906752A/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
    • D04B35/18—Indicating, warning, or safety devices, e.g. stop motions responsive to breakage, misplacement, or malfunctioning of knitting instruments

Definitions

  • a latch detector stop motion system for circular knitting machines including an electrically conductive contact probe connected to one input of one of a pair of NAND gates cross-connected as a bistable flip-flop which is set by application of supply'voltage to the flip-flop to provide a high voltage state at the output and changes state responsive to contact of the probe with a closed needle latch to provide a low voltage state at the output which activates a gate and relay driver transistor to energize a stop motion relay.
  • the present invention relates in general to stop motion devices having latch detectors for circular knitting machines, and more particularly to devices for undesired closed needle latches on the needles of circular knitting machines during operation of the knitting machine with great speed and high reliability without requiring application of mechanical force to the latch engaging member for producing a signal indicating a closed latch.
  • the cylinder needles are moved along a circular path by the rotating cylinder and are raised and lowered in accordance with the settings of cams on the knitting machine in the path of travel of the needle butts to bring the needles out at the feed position to receive the yarn in the needle hook, after which the needles are withdrawn back to their normal knitting positions for movement around the remainder of the circular path defined by the needle cylinder.
  • each individual needle latch is opened and closed in a prearranged order so as to form a new loop or stitch.
  • the latch In the highest position of the needle, where the yarn is caught by the needle hook, the latch is in open condition, and if for any reason the latch is closed or partly closed at this position instead of remaining open, an irregularity or fault is produced in the knitted fabric. Also, the fact that the latch is closed at the high position of the needle when it should normally be opened may be the result of yarn breakage, as well as other faulty conditions, any of which cause the fabric being knitted thereafter to be damaged or faulty.
  • An object of the present invention is the provision of.
  • a reliable stop motion closed latch detector for circular knitting machines which does not require mechanical translatory movement of the contact probe or feeler by the closed latch to achieve closed latch detection and which provides electrical current to activate a stop motion relay which in turn interrupts the supply to the motor operating the knitting machine to stop rotation of the needle cylinder.
  • Another object of the present invention is the provision of the novel stop motion device for detecting closed needle latches in the needles of circular knitting machines which overcomes disadvantages of prior art stop motion devices requiring mechanical force to move the contact member and effect closure of an electrical circuit, the novel stop motion device being operative by merely establishing an electric current path to ground through the closed needle latch and knitting machine frame when the contact probe or feeler engages the closed latch, thereby avoiding variations in the speed of activation of a stop motion relay which may arise due to variation in mechanical force applied to latch engaging members of the prior art mechanical stop motion devices and avoiding unnecessary damage to the needle latches.
  • Another object of the present invention is the provisions of a stop motion device for detecting closed or partially closed latches of needles in circular knitting machines wherein a contact probe is electrically grounded through the knitting machine frame upon engagement with a closed needle latch and activate a pair of cross connected NAND gates forming a bistable flipflop circuit to produce an output signal for activating a stop motion relay in a most reliable and rapid manner, and which may be arranged in a highly compact physical unit readily capable of placement in limited spaces on circular knitting machines.
  • Another object of the present invention is the provision of a stop motion device for detecting closed needle latches at the yarn feed stations of a circular knitting machine, which device relies on very low supply voltage and low current minimizing electrical shock hazzards to the knitting machine operator.
  • FIG. I is a diagrammatic view illustrating a pair of latch detectors each adjacent a needle of an associated set of needles, such as cylinder and dial needles, of a circular knitting machine, and connected to a power supply and relay control unit;
  • FIG. 2 is a schematic diagram illustrating the electrical circuit of the needle latch detector shown adjacent a diagrammatically indicated needle of a knitting machine;
  • FIG. 3 is a top plan view of a needle detector embodying the present invention, showing the physical configuration thereof moved from the housing shell;
  • FIG. 4 is a side elevation view of the latch detector, viewed from below FIG. 3.
  • the needle latch detector of the present invention can be used with knitting devices other than circular knitting machines, it will be described, by way of example, in association with a circular knitting machine having a rotating needle cylinder, not shown, provided with a plurality of vertically or axially extending channels or needle grooves in the outer surface of the cylinder. ln such a machine, the cylinder needles in the grooves are raised and lowered in accordance with the shape of a stationary cam track defined by the usual cams of the circular knitting machine, whereby the cam track received the needle butts and raises the needles by action of the cam surfaces on the butt of each cylinder needle.
  • the latch detector is designed to monitor the condition of the needle latches to be sure that the latch is opened when the needle reaches the highest position immediately prior to taking the new yarn into the hook of the needle
  • the latch detector is conventionally located at a test station near the yarn feed station where the cylinder needles are brought up or raised to the yarn feed position.
  • the cams for the cylinder needles provide an upwardly inclining ramp surface along the cam track whereby the needles progressively rise from a lower knit position to a higher feed position where the yarn is introducted into the hook of each needle as the cylinder progressively rotates.
  • the normal position for the cylinder needle latch detector of the present invention is such that the contact probe or conductor wire of the latch detector terminates immediately below the end of the hook of the needles just before they reach the top of the upwardly inclined approach to the yarn feed position. If the latches are in their proper open positions, shown in H6. 1,-as they approach and move through the test station, they move along what may be termed their normal path and do not engage the contact probe. If the latch of any of the needles is in closed position at the test station, the latch then moves along what may be called an abnormaLpath and momentarily engages the contact probeslf the cylinder needles are raised at several feed locations about the periphery of the cylinder, then latch detectorsmay be provided adjacenteach of the feed positions.
  • the circular knitting machine is of the. type having dial needles as well as cylinder needles
  • -a latch detector or detectors are also provided im- -mediately in advance of the feed position where the dial needles take the yarn, so as to monitor the condition of the dial needle latches.
  • FIG. 1 The system of needle latch detectors embodying the present invention is diagrammatically illustrated in FIG. 1, wherein latch detectors indicated generally at and 11 have probes l2 and 13 in the paths of closed latches of the cylinder needles l4 and dial needles 15 respectively.
  • the probes are disposed at locations where the probes will not engage any open latches moving along their normal paths but will momentarily engage any closed latch moving along the aforementioned abnormal path.
  • the latch detectors l0 and 11 diagrammatically shown in FIG. 1 include a housing shell 16 which in the illustrated embodiment has a tapered conical capacitor C-l, a current limiting resistor R-3, a driver nose at one end thereof from which the probe 12 or 13 projects, and has an indicator lamp 17 at the opposite end thereof to be illuminated and provide a visual indication when a closed latch has been detected.
  • Conductor wires, indicated at 18, from the latch detector or detectors 10, 11 are connected to a power supply, which in the preferred embodiment is a conventional 5 volt regulated power supply, indicated by the reference character 19, and other electrical conductor leads 20 connect the latch detector or detectors l0, 11 to a relay control unit 21 indicated in block diagram form in FIG. 1.
  • a power supply which in the preferred embodiment is a conventional 5 volt regulated power supply, indicated by the reference character 19, and other electrical conductor leads 20 connect the latch detector or detectors l0, 11 to a relay control unit 21 indicated in block diagram form in FIG. 1.
  • FIGS. 3 and 4 The physical construction of a preferred embodiment of the latch detector is illustrated in FIGS. 3 and 4, wherein the latch detector is indicated generally by the reference character 10, and comprises a printed circuit board or panel of thin rectangular configuration, indicated by the reference character 25, formed in the usual manner of an insulating substrate and photo etched patterns of conductive layer or coating material thereon, on which is mounted the contact probe which has the form of a conductor wire 26 which in the preferred embodiment has a coil spring configuration indicated at 26a on the inner neck portion adjacent the mounting head formation 26!; by which it is secured to the printed circuit board 25.
  • the latch detector is indicated generally by the reference character 10, and comprises a printed circuit board or panel of thin rectangular configuration, indicated by the reference character 25, formed in the usual manner of an insulating substrate and photo etched patterns of conductive layer or coating material thereon, on which is mounted the contact probe which has the form of a conductor wire 26 which in the preferred embodiment has a coil spring configuration indicated at 26a on the inner neck portion adjacent the mounting head formation 26!; by which it is secured
  • the outer free end or tip 26c of the probe is to be positioned relative to the cylinder needle or dial needle immediately below or inwardly of the tip of the hook on the needle at the location normally occupied by the needle latch as it moves .in closed position along the abnormal path, in the region of the needle path about the circular knitting machine cylinder where the needle is immediately approaching the feed position where the hook takes the yarn.
  • a small rectangular integrated circuit module or member 27 forming a pair of NAND gates, to be later described, which is preferably a Texas Instruments SN- 7400 TTL, as well as a pair of resistors R-1 and R-2, a
  • the latch detector may generally be described as basically a bounceless switch", which automatically sets itself into the off state after the power has been applied, and when a closed latch of the needles being monitored touches the contact probe 26, the output from the units switches from 0 or low state to the l or high state, providing an output signal to be processed to energize the stop motion relay.
  • the power supply must be interrupted in order to reset the bounceless switch" of the circuit once it has been set by contact with a closed latch.
  • the contact probe 12 which is engaged by the needle latch if the latch moves along the abnormal path in closed position is electrically connected to the pin 1 of the NAND gate 1 section G-l, forming part of the SN-7400 TTL integrated circuit unit 27, and the probe and pin 1 of NAND gate G-l are also connected through resistor R-l to the +5 volt supply terminal of power supply 19.
  • the NAND gate G2 associated with pins 4, 5 and 6 of the SN7400 TTL integrated circuit unit 27 has its pin 5 connected through the K ohm resistor R-2 to the +5 volt supply and through the capacitor C'l to ground.
  • the two outputs and inputs of the NAND gates G-1 and G-2 are cross connected, in the manner illustrated in FIG. 2, in such a way that the resulting circuit acts as a bistable or RS flip-flop.
  • Each of the NAND gates G-1 and 6-2 form a separate circuit which requires a voltage in the order of 3.0 volts or higher on its two inputs in order to change its output state from a high voltage to a low logic voltage state of less than 0.8 volts. If any of the inputs to either NAND gate, for example the inputs at pins 1 or 2 of NAND gate G-] or the inputs at pins 4 or 5 of NAND gate G-2, changes to a low logic voltage state (less than 0.8 volts), this causes the particular output to change its state to a high voltage.
  • the logic condition of the outputs of this bistable or RS flip-flop is determined both by the instantaneous and the prior condition of its inputs.
  • the bistable flip-flop has been modified in such a way that the output at pin 3 of the NAND gate 6-1 will change to the low state shortly after supply voltage is being applied to the latch detector circuit. This is accomplished by capacitor C-l, resistor R-2 and NAND gate G-2. Upon initial power supply turn-on, capacitor C-l becomes charged at a rate determined by the resistor R-2 and the input current from NAND gate G-2. During the charge time (determined by the value of capacitor C-1 and resistor R-2) the logic state of input 5 of NAND gate 6-2 will relatively slowly change from the low logic state to the high state.
  • the input at pin 1 of NAND gate (5-1 is held high at all times by the resistor R-l except when the contact probe 12 touches a closed latch, which forces the voltage level at input pin 1 of gate G-l immediately to ground during the moment of contact.
  • the ground connection of all the latch detectors associated with the knitting machine and the ground connection of the power supply are connected to the knitting machine frame.
  • the contact probe 12 or 13 momentarily touches a closed latch of a needle in the group of needles being monitored, the input at the pin 1 of NAND gate 6-1 is momentarily held down to ground level, so that the bistable flip-flop formed by the cross connected NAND gates G-1 and G-2 changes state, causing the output at pin 3 of NAND gate 6-1 to go high, thus causing the transistor Q-l, which may be a 2N 1613 transistor, to conduct, as the base of the transistor is connected through the resistor R-3 to the pin 3 of gate G-l.
  • the latch detector circuit will remain in this activated state with the transistor Q-2 conducting and the motor relay energized to break the supply circuit to the knitting machine motor until either the knitting machine is manually turned off or the operator starts up the knitting machine again, which will remove the supply voltage from the circuit whereupon the charge developed across the capacitor C-l leaks'off and input 5 on NAND gate G-2 returns to ground potential. Releasing of the start button for the machine will again apply supply voltage as previously described, resetting all of the latch detectors without any specific action by the operator. I v
  • a stop motion device for detecting closed needle latches of needles moving through a test station near a yard feed station in a circular knitting machine wherein the needles and their latches conductively communicate with electrical ground and the latches in the region of said test station move along a normal path when in open position and move along an abnormal path when in undesired closed position, comprising a normallyungrounded electrically conductive contact probe disposed adjacent said test station at a location along said abnormal path to conductively contact any closed latch and momentarily establish an electrical grounding path from the probe through the closed latch, a bistable flipflop circuit having first and second input terminals, the first input terminal being connected to said probe to be momentarily connected directly to ground through the probe and closed latch when the probe contacts a closed latch, said flip-flop circuit having connection means including means connecting supply voltage to the first input terminal to set the flip-flop circuit upon application of supply voltage thereto to a ready first state wherein a normal first voltage state is provided at an output thereof and wherein the flip-flop is conditioned to respond to moment
  • a stop motion device for detecting closed needle latches as defined in claim 1, wherein said bistable flipflop circuit comprises a pair of NAND gates each having a pair of inputs and an output, one input of a first one of said NAND gates forming said first input termi nal and being connected to said probe and through a resistor to a supply voltage source and an input of a second one of said NAND gates forming said second input terminal and being connected through a resistor to said supply voltage source and through a capacitor to ground and the remaining inputs of said NAND gates being cross-connected to the output of the other NAND gates, and said output of said flipflop being the output of the second of said NAND gates.
  • a stop motion device for detecting closed needle latches as defined in claim 3, wherein said bistable flipflop circuit comprises a pair of NAND gates each having a pair of inputs and an output, one input of a first one of said NAND gates forming said first input terminal and being connected to said probe and through a resistor to said supply voltage source and an input of a second one of said NAND gates forming said second input terminal and being connected through said first mentioned resistor to said supply voltage source and through said capacitor to ground and the remaining inputs of said NAND gates being cross-connected to the output of the other NAND gates, and said output of said flip-flop being the output of the second of said NAND gates.
  • a stop motion device as defined in claim 1 including gate means having a plurality of inputs and an output, means connecting one of said inputs to the output of said flip-flop circuit and the other inputs of said gate means being adapted to be connected to the similar output of similar flip-flop circuits of additional like closed latch detectors, and said relay control circuit including a normally non-conducting relay driver transistor controlling current flow through the winding of said relay and connected to the input of said gate means to conduct and activate said relay upon application of said second voltage state to any of the inputs of said gate means.
  • a stop motion device as defined in claim 5 including gate means having a plurality of inputs and an output, means connecting one of said gate inputs to the output of said flip-flop circuit and the other inputs of said gate means being adapted to be connected to the similar output of similar flip-flop circuits of additional like closed latch detectors, and said relay control circuit including a normally non-conducting relay driver transistor controlling current flow through the winding of said relay and connected to the input of said gate means to conduct and activate said relay upon application of said second voltage state to any of the inputs of said gate means.
  • a stop motion device for detecting closed needle latches of needles moving through a test station near a yarn feed station in a circular knitting machine wherein the needles and their latches conductivcly communicate with electrical ground and the latches in the region of said test station move along a normal path when in open position and move along an abnormal path when in undesired closed position, comprising a normally ungrounded electrically conductive contact probe disposed adjacent said test station at a location along said abnormal path to conductivcly contact any closed latches and momentarily establish an electricaly grounding path from the probe through the closed latch, a bistable flip-flop circuit formed of a pair of cross-connected NAND gates each having a pair of inputs and an output, one input of a first one of said NAND gates forming a first input terminal for the flipflop circuit connected to said probe to be momentarily connected directly to ground through the probe and closed latch when the probe contacts a closed latch, connecting means including connections between said NAND gates and including means connecting supply voltage to said first input terminal to initially set the
  • a stop motion device as defined in claim 8 including gate means having a plurality of inputs and an output, means connecting one of said inputs to the output of the second one of said NAND gates and the other inputs of said gate means being adapted to be connected to the similar output of similar flip-flop circuits of additional like closed latch detectors, and said relay control circuit including a normally nonconducting relay driver transistor controlling current flow through the winding of said relay and connected to the output of said gate means to conduct and activate said relay upon application of said higher voltage state to any of the inputs of said gate means.
  • a stop motion device as defined in claim 9, including gate means having a plurality of inputs and an output, means connecting one of said inputs to the output of the second one of said NAND gates and the other inputs of said gate means being adapted to be connected to the similar output of similar flip-flop circuits of additional like closed latch detectors, and said relay control circuit including a normally nonconducting relay driver transistor controlling current flow through the winding of said relay and connected to the output of said gate means to conduct and activate said relay upon application of said higher voltage state to any of the inputs of said gate means.
  • a stop motion device as defined in claim 10 including a normally non-conducting lamp controlling transistor connected to an indicator lamp to regulate current flow therethrough and connected to the output of the first one of said NAND gates to energize said indicator lamp when said probe contacts a closed latch.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US449066A 1974-03-07 1974-03-07 Latch detector stop motion system for circular knitting machines Expired - Lifetime US3906752A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US449066A US3906752A (en) 1974-03-07 1974-03-07 Latch detector stop motion system for circular knitting machines
CA197,933A CA995335A (en) 1974-03-07 1974-04-22 Latch detector stop motion system for circular knitting machines
GB1764474A GB1406598A (en) 1974-03-07 1974-04-23 Latch detector stop motion device for circular knitting machines
NL7405544A NL7405544A (nl) 1974-03-07 1974-04-24 Inrichting voor het stilzetten van een rond- breimachine.
IT50747/74A IT1011348B (it) 1974-03-07 1974-05-02 Perfezionamento nelle macchine circolari per maglieria
FR7417378A FR2263326B1 (enrdf_load_stackoverflow) 1974-03-07 1974-05-17
AU69551/74A AU478054B2 (en) 1974-03-07 1974-05-29 Latch detector stop motion system for circular knitting machines
CH742374A CH582263A5 (enrdf_load_stackoverflow) 1974-03-07 1974-05-30
JP49062459A JPS50118056A (enrdf_load_stackoverflow) 1974-03-07 1974-05-31
DE19742427079 DE2427079A1 (de) 1974-03-07 1974-06-05 Nadelzungendetektor-abschaltsystem fuer rundstrickmaschinen
ES427393A ES427393A1 (es) 1974-03-07 1974-06-18 Un dispositivo de parada de movimiento para deteccion de lenguetas de agujas cerradas.
BR7416/74A BR7407416A (pt) 1974-03-07 1974-09-06 Dispositivo para parada para detectar lingueetas de agulha fechadas num tear circular de malharia

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US449066A US3906752A (en) 1974-03-07 1974-03-07 Latch detector stop motion system for circular knitting machines

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US3906752A true US3906752A (en) 1975-09-23

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US449066A Expired - Lifetime US3906752A (en) 1974-03-07 1974-03-07 Latch detector stop motion system for circular knitting machines

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US (1) US3906752A (enrdf_load_stackoverflow)
JP (1) JPS50118056A (enrdf_load_stackoverflow)
BR (1) BR7407416A (enrdf_load_stackoverflow)
CA (1) CA995335A (enrdf_load_stackoverflow)
CH (1) CH582263A5 (enrdf_load_stackoverflow)
DE (1) DE2427079A1 (enrdf_load_stackoverflow)
ES (1) ES427393A1 (enrdf_load_stackoverflow)
FR (1) FR2263326B1 (enrdf_load_stackoverflow)
GB (1) GB1406598A (enrdf_load_stackoverflow)
IT (1) IT1011348B (enrdf_load_stackoverflow)
NL (1) NL7405544A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020655A (en) * 1975-01-22 1977-05-03 Centre Technique Industriel Dit: Institut Textile De France Device for detecting defects in needles on a knitting loom which is in operation
US4026128A (en) * 1975-12-12 1977-05-31 Universal Textile Machine Corporation Faulty needle sensing
US4033149A (en) * 1976-07-26 1977-07-05 The Raymond Lee Organization, Inc. Latch closer in combination with a closed latch detector
US4366681A (en) * 1978-05-31 1983-01-04 Meiners Electronic Controls Ltd. Detection of flaws, breakages, discontinuities and the like

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3476879A (en) * 1968-01-10 1969-11-04 Walter J Zenner Line relay for d.c. telegraph systems
US3529444A (en) * 1967-03-07 1970-09-22 Billi Spa Circular knitting machines
US3585624A (en) * 1968-11-20 1971-06-15 Morat Gmbh Franz Feeler-controlled stop motion device
US3659437A (en) * 1969-07-25 1972-05-02 Reynolds Tobacco Co R Knitting machine defective needle detector
US3690127A (en) * 1971-03-15 1972-09-12 Stop Motion Devices Corp Defective latch needle detector and control network therefor
US3731205A (en) * 1972-03-23 1973-05-01 Embhart Corp Sequence detector circuit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3529444A (en) * 1967-03-07 1970-09-22 Billi Spa Circular knitting machines
US3476879A (en) * 1968-01-10 1969-11-04 Walter J Zenner Line relay for d.c. telegraph systems
US3585624A (en) * 1968-11-20 1971-06-15 Morat Gmbh Franz Feeler-controlled stop motion device
US3659437A (en) * 1969-07-25 1972-05-02 Reynolds Tobacco Co R Knitting machine defective needle detector
US3690127A (en) * 1971-03-15 1972-09-12 Stop Motion Devices Corp Defective latch needle detector and control network therefor
US3731205A (en) * 1972-03-23 1973-05-01 Embhart Corp Sequence detector circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020655A (en) * 1975-01-22 1977-05-03 Centre Technique Industriel Dit: Institut Textile De France Device for detecting defects in needles on a knitting loom which is in operation
US4026128A (en) * 1975-12-12 1977-05-31 Universal Textile Machine Corporation Faulty needle sensing
US4033149A (en) * 1976-07-26 1977-07-05 The Raymond Lee Organization, Inc. Latch closer in combination with a closed latch detector
US4366681A (en) * 1978-05-31 1983-01-04 Meiners Electronic Controls Ltd. Detection of flaws, breakages, discontinuities and the like

Also Published As

Publication number Publication date
IT1011348B (it) 1977-01-20
JPS50118056A (enrdf_load_stackoverflow) 1975-09-16
ES427393A1 (es) 1976-07-16
NL7405544A (nl) 1975-09-09
GB1406598A (en) 1975-09-17
FR2263326A1 (enrdf_load_stackoverflow) 1975-10-03
DE2427079A1 (de) 1975-09-18
CH582263A5 (enrdf_load_stackoverflow) 1976-11-30
FR2263326B1 (enrdf_load_stackoverflow) 1978-03-24
BR7407416A (pt) 1976-04-27
AU6955174A (en) 1975-12-04
CA995335A (en) 1976-08-17

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