Abstract: A tamper-resistant lock assembly comprising a plate having a slot for receiving a key, the slot extending through the plate from an opening in a front face thereof to an exit in an opposing rear face thereof, the opening having a first profile and the exit having a second, different profile, the key comprising a shaft having a bit extending therefrom, the bit being formed of a shape memory material and being pre-configured such that its cross-sectional shape in its temporary form matches the first profile and the bit can be inserted through the slot via the opening and, upon application of a predetermined external stimulus, returns to a permanent form in which its cross-sectional shape matches the second profile and the bit can be retracted from the slot via the exit.

Abstract: A waveguide comprising first and second waveguide sections, each waveguide section comprising a main body portion (12) and a connecting portion (14) at its distal end, said first and second waveguide sections being longitudinally aligned to define a conduit therethrough with a butted interface (28) therebetween, the connecting portion of each waveguide section having: (i) a first circumferential ridge (16) on its outer surface located adjacent its distal end, (ii) a second circumferential ridge (18) on its outer surface spaced apart from the first circumferential ridge, and (iii) a third circumferential ridge (20) on its outer surface located between said first and second circumferential ridges, such that a first respective recess (19) is defined between said second and third circumferential ridges and a second respective recess (17) is defined between said first and third circumferential ridges; the waveguide further comprising a sleeve member (22) over said butted interface (28), such that a respective firs

Abstract: A tamper-resistant lock assembly comprising a plate having a slot for receiving a key, the slot extending through the plate from an opening in a front face thereof to an exit in an opposing rear face thereof, the opening having a first profile and the exit having a second, different profile, the key comprising a shaft having a bit extending therefrom, the bit being formed of a shape memory material and being pre-configured such that its cross-sectional shape in its temporary form matches the first profile and the bit can be inserted through the slot via the opening and, upon application of a predetermined external stimulus, returns to a permanent form in which its cross-sectional shape matches the second profile and the bit can be retracted from the slot via the exit.

Abstract: A waveguide comprising first and second waveguide sections, each waveguide section comprising a main body portion (12) and a connecting portion (14) at its distal end, said first and second waveguide sections being longitudinally aligned to define a conduit therethrough with a butted interface (28) therebetween, the connecting portion of each waveguide section having: (i) a first circumferential ridge (16) on its outer surface located adjacent its distal end, (ii) a second circumferential ridge (18) on its outer surface spaced apart from the first circumferential ridge, and (iii) a third circumferential ridge (20) on its outer surface located between said first and second circumferential ridges, such that a first respective recess (19) is defined between said second and third circumferential ridges and a second respective recess (17) is defined between said first and third circumferential ridges; the waveguide further comprising a sleeve member (22) over said butted interface (28), such that a respective firs