The phrase "a proof of cost" is correct and usable in written English.
It can be used when referring to a document or evidence that verifies the expenses incurred for a particular service or product.
Example: "Please provide a proof of cost for the materials purchased for the project."
Alternatives: "a cost verification" or "a cost receipt".
Mr Immelt called for the new approach to be applied, starting with a proof-of-concept exercise costing $25m.
We present a proof-of-concept low-cost autonomous digital processing system (AS), capable of recognizing the male calls of the leafhopper Aphrodes bicincta "Dragonja" and generating female replies.
On the whole, the device can be presented as a proof-of-concept in the fields of low-cost and flexible smart windows.
To initiate a claim you will need to wait 45 days if it's missing, and provide proof of cost of item.
When designing new magnetic separators and/or classifiers or optimizing existing ones, it is usual to face several obstacles: the high cost of a proof of concept full laboratorial setup (including preliminary optimization procedures and/or feasibility demonstrations), time-consuming experiments, lack of flexibility of the assembled laboratorial apparatus, feed complexity, among others.
The case study, relating to the construction of high performance, low cost housing, provides a proof of concept and shows that such platforms can provide an informal and engaging method for project-related discussions, in addition to providing advantageous visualizations to project stakeholders.
We use distal and local eruption scenarios as a proof of concept, and to demonstrate how potential cost and duration of tephra clean-up operations in Auckland can yield useful information for planning purposes.
Prezado Y, et al. Transfer of Minibeam Radiation Therapy into a cost-effective equipment: a proof of concept.
The prototype is a proof of concept that can help users save costs of purchase and qualification of equipment, reduce factory footprint, and reduce the risk of contamination during culture transfer from one intermediate bag to another.
Here, we report a novel proof-of-principle, cost effective, and simple technology of "adherent" enrichment and subsequent expansion of NK cells for adaptive cell therapy applications utilizing ionomycin and IL-2 priming/activation of NK cells in PBMCs.
