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In North America, instead of a PTT there was the private monopoly Bell System (for the US)/Bell Canada (dominant ILEC in Ontario, Quebec and (historically) parts of what is now Nunavut; competes with other fixed-line carriers in the rest of Canada) responsible for telecommunications and a separate federally run US Postal Service/Canada Post for mail delivery.
Polytrimethylene terephthalate (PTT), is a polyester synthesized and patented in 1941. [ 1 ] [ 2 ] It is produced by a method called condensation polymerization or transesterification . The two monomer units used in producing this polymer are: 1,3-propanediol and terephthalic acid or dimethyl terephthalate .
The partial thromboplastin time (PTT), also known as the activated partial thromboplastin time (aPTT or APTT), is a blood test that characterizes coagulation of the blood. A historical name for this measure is the Kaolin-cephalin clotting time ( KCCT ), [ 1 ] reflecting kaolin and cephalin as materials historically used in the test.
1836: Specie Circular – Required payment for public lands be in gold and silver specie, repealed in 1838 1863: Proclamation of Amnesty and Reconstruction – Laid out President Abraham Lincoln's preliminary "10% plan" for reintegrating the "states in rebellion" back into the Union [7]
Push-to-talk (PTT), also known as press-to-transmit, is a method of having conversations or talking on half-duplex communication lines, including two-way radio, using a momentary button to switch from voice reception mode to transmit mode.
Sorona is DuPont de Nemours, Inc.'s brand of Triexta, a subclass of polytrimethylene terephthalate (PTT) [1] named and commercialized in 2000. [2] The fibers are soft and stain-resistant while exhibiting high strength and stiffness.
The signaling unit is the special modem that converts the DC signaling protocol into tones that could be transmitted over a four-wire link back to the PTT exchange. The signaling unit and trunk circuit communicate their status over the E and M leads, using a combination of battery and earth (also known as ground) levels.
Photothermal therapy (PTT) refers to efforts to use electromagnetic radiation (most often in infrared wavelengths) for the treatment of various medical conditions, including cancer. This neurotherapy is an extension of photodynamic therapy, in which a photosensitizer is excited with specific band light.