A pushbutton switch assembly includes a molded housing body with an integral central barrel, a pushbutton mounted in the housing body and having a stem plunger received in and longitudinally movable in the barrel with the operation of the pushbutton and a return spring for returning the pushbutton to a normal position when it is depressed and released. The casing has a needle assembly opening at the front of the barrel portion and a trigger slot at the front of the handle portion. 2 to 100 kgh of a molten additive polymer is metered to the second polyester stream, and the additive polymer together with the second polyester stream is passed through a first mixing line. The system further includes a first mechanical stop to hold the indicator at the first position when the racking mechanism is in the connected condition, and a second mechanical stop to hold the indicator at the second position when the racking mechanism is in the disconnected condition. The efficiency and flexibility afforded by WSRTs is essential to emerging enterprise architectures based on SOA. In cross sections of the secondary particles, a total cross-sectional area of part of the primary particles at least partially exposed at the surfaces of the secondary particles is at least 40% of a total cross-sectional area of the primary particles constituting the secondary particles.