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Part number: 10461
An instrument, simple and quick to use, which determines the heating requir...
Part number: 10459
This calculator gives the heat requirements of new homes built to meet the ...
Part number: 10462
An instrument designed to simplify the calculations for all the larger heat...
Part number: 10464
A double-sided instrument for calculations relating to the flow of all gase...
Part number: 17357
Part number: 10460
Part number: 10463
Part number: 10468
The efficiency of a boiler is determined largely by the heat lost to any ex...
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