Abstract: An electrical plug, of male or female construction, provided with a relatively enlarged opening between the main conductors of the plug such as outwardly projecting prongs or inwardly disposed blades, for removal from and insertion therein of an overcurrent-protection device and cooperating safety latch means. The direction in which said device and latch means are removed from the plug is the same as the direction in which the plug is engaged to its mating electrical device so that such removal and replacement may be effected only if the plug or socket is not in union with its mating electrical device.

Abstract: An electrical plug or socket having a replaceable overcurrent-protection device positioned within the plug or socket body. There is provided a safety latch means including a latch member adapted to be inserted into the plug or socket body to protect, to shield, to hold, to pass through, to engage or to affix the overcurrent-protection device or a base carrying the overcurrent-protection device, so as to prevent the overcurrent-protection device from being removed or slipping off, to improved the contact performance between the overcurrent-protection device and the contact terminals for connecting the overcurrent-protection device into a circuit, and thus to realize the maximum degree of safety of the electrical plug or socket. The safety latch means can be readily removed from the plug or socket for quick and inexpensive replacement of the overcurrent-protection device.

Abstract: A packing device comprising a protective panel, a base member and a fastener element made of insulative material for decorative light string sets of various sizes and different numbers of lights. The fastener elements having a plurality of claws, the number of which is identical to the number of bulbs to be held and the claws hold sockets of the bulbs firmly so that a packed decorative light string set is secured and held uniformly. The packing operation is therefore fast and simply.